Number of (n+2) X (2+2) 0..2 arrays with every 3 X 3 subblock row, column, diagonal and antidiagonal sum not equal to 2 3 or 4.
A252337
Number of (n+2) X (2+2) 0..2 arrays with every 3 X 3 subblock row, column, diagonal and antidiagonal sum not equal to 2 3 or 4.
Terms
- a(0) =108a(1) =268a(2) =810a(3) =2242a(4) =6030a(5) =16676a(6) =46154a(7) =126892a(8) =349380a(9) =963126a(10) =2653330a(11) =7308822a(12) =20136340a(13) =55476206a(14) =152832896a(15) =421048884a(16) =1159980142a(17) =3195705226a(18) =8804055846a(19) =24254890552a(20) =66821428650a(21) =184090811336a(22) =507164105456
External references
- oeis: A252337