Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 2 4 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 2 4 6 or 7.
A252517
Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 2 4 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 2 4 6 or 7.
Terms
- a(0) =791a(1) =432a(2) =798a(3) =1169a(4) =2492a(5) =5214a(6) =9069a(7) =20926a(8) =45114a(9) =80515a(10) =188382a(11) =409396a(12) =733465a(13) =1722606a(14) =3755646a(15) =6734185a(16) =15840028a(17) =34586990a(18) =62035719a(19) =146024522a(20) =319084220a(21) =572390435a(22) =1347812928a(23) =2946242464a(24) =5285469629a(25) =12447910092a(26) =27215356622
External references
- oeis: A252517