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

Author

R. H. Hardin Oct 10 2010

Keywords

• nonn

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)[phone]*a(n-8)-14668480*a(n-9)-554895616*a(n-10)[phone]*a(n-11)[phone]*a(n-12)-5523241472*a(n-13)-6148366336*a(n-14)[phone]*a(n-15)[phone]*a(n-16)-26980270080*a(n-17)[phone]*a(n-18)[phone]*a(n-19)-9858056192*a(n-20)-3497000960*a(n-21)[phone]*a(n-22)-260046848*a(n-24)[phone]*a(n-25)