A181211 Number of nX7 binary matrices with no two 1's adjacent diagonally or antidiagonally

128, 1156, 38936, 652864, 15786848, 315701824, 6985036032, 146719641600, 3168621039616, 67463750631424, 1447364588320768, 30930859081810944, 662387735874816000, 14169961476541661184, 303300655391773020160

Offset

1,1

Comments

Column 7 of A181212

Links

R. H. Hardin, Table of n, a(n) for n=1..100

Formula

Empirical: a(n)=30*a(n-1)-5664*a(n-3)+28924*a(n-4)+269000*a(n-5)-2020704*a(n-6)-3766112*a(n-7)+50266144*a(n-8)-14668480*a(n-9)-554895616*a(n-10)+703166720*a(n-11)+2841716480*a(n-12)-5523241472*a(n-13)-6148366336*a(n-14)+18197354496*a(n-15)+2156556288*a(n-16)-26980270080*a(n-17)+8757542912*a(n-18)+17095786496*a(n-19)-9858056192*a(n-20)-3497000960*a(n-21)+3006267392*a(n-22)-260046848*a(n-24)+33554432*a(n-25)

Crossrefs

Sequence in context: A134630 A133061 A188822 * A221071 A070055 A247930

Adjacent sequences: A181208 A181209 A181210 * A181212 A181213 A181214

Keyword

nonn

Author

R. H. Hardin Oct 10 2010

Status

approved