Number of (1+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 2 5 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 2 5 6 or 7.
A252680
Number of (1+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 2 5 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 2 5 6 or 7.
Terms
- a(0) =656a(1) =775a(2) =901a(3) =1246a(4) =1802a(5) =2564a(6) =3654a(7) =6075a(8) =9691a(9) =14591a(10) =25932a(11) =43618a(12) =66923a(13) =122615a(14) =210754a(15) =325664a(16) =604389a(17) =1048008a(18) =1624634a(19) =3031099a(20) =5275727a(21) =8191512a(22) =15312997a(23) =26698487a(24) =41493532a(25) =77612674a(26) =135438545a(27) =210636520a(28) =393990535
External references
- oeis: A252680