Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 2 5 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 0 2 5 6 or 7.
A252507
Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 2 5 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 0 2 5 6 or 7.
Terms
- a(0) =1262a(1) =1515a(2) =2055a(3) =3326a(4) =5508a(5) =9526a(6) =17709a(7) =33357a(8) =62632a(9) =119155a(10) =230081a(11) =444951a(12) =865104a(13) =1681217a(14) =3279686a(15) =6410134a(16) =12571858a(17) =24617069a(18) =48369787a(19) =95007820a(20) =187003788a(21) =367894926a(22) =725427778a(23) =1428661348a(24) =2819873256a(25) =5561285116
External references
- oeis: A252507