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FOR b=0 TO 9
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FOR c=0 TO 9
IF ((c=a) OR (c=b) OR (c=b+1) OR (b=c+1) OR (c=b+9) OR (b=c+9)) THEN GOTO 20
FOR d=0 TO 9
IF ((d=a) OR (d=b) OR (d=c) OR (d=c+1) OR (c=d+1) OR (d=c+9) OR (c=d+9)) THEN GOTO 10
LET x=1000*a+100*b+10*c+d
print x
10 NEXT d
20 NEXT c
30 NEXT b
40 NEXT a
END
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g(1) = 10
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g(2) = 10 * 9 - f(2) = 90 - 20 = 70
f(3) = f(2) * 8 + g(2) * 2 = 20 * 8 + 70 * 2 = 160 + 140 = 300
g(3) = 10 * 9 * 8 - f(3) = 720 - 300 = 420
f(4) = f(3) * 7 + g(3) * 2 - 10 * (1 * 1 + 1 * 1 + 5 * 2) = 300 * 7 + 420 * 2 - 10 * 12 = 2100 + 840 - 120 = 2820
g(4) = 10 * 9 * 8 * 7 - f(4) = 5040 - 2820 = 2220
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http://www.research.att.com/~njas/sequences/A002464
A002464
Hertzsprung's problem: ways to arrange n non-attacking kings on an n X n board, with 1 in each row and column.
Also number of permutations of length n without rising or falling successions.
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