Number of (n+2) X (2+2) 0..3 arrays with every 3 X 3 subblock row, column, diagonal and antidiagonal sum not equal to 2 3 4 6 or 7.
A252263
Number of (n+2) X (2+2) 0..3 arrays with every 3 X 3 subblock row, column, diagonal and antidiagonal sum not equal to 2 3 4 6 or 7.
Terms
- a(0) =130a(1) =272a(2) =822a(3) =2290a(4) =6164a(5) =17008a(6) =47094a(7) =129530a(8) =356572a(9) =982904a(10) =2707976a(11) =7459326a(12) =20550724a(13) =56618068a(14) =155978958a(15) =429715562a(16) =1183856500a(17) =3261484928a(18) =8985276082a(19) =24754144796a(20) =68196859814a(21) =187880079930a(22) =517603410590
External references
- oeis: A252263