Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 3 5 6 or 8.
A252466
Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 3 5 6 or 8.
Terms
- a(0) =570a(1) =716a(2) =1299a(3) =2380a(4) =4507a(5) =8624a(6) =17061a(7) =34876a(8) =71785a(9) =147822a(10) =307470a(11) =642671a(12) =1344403a(13) =2822439a(14) =5937839a(15) =12500966a(16) =26372679a(17) =55715764a(18) =117803237a(19) =249445448a(20) =528853149a(21) =1122332206a(22) =2384791251a(23) =5073248300a(24) =10803996948a(25) =23035159625
External references
- oeis: A252466