Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum 2 4 5 or 7 and every diagonal and antidiagonal sum not 2 4 5 or 7.
A251917
Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum 2 4 5 or 7 and every diagonal and antidiagonal sum not 2 4 5 or 7.
Terms
- a(0) =1914a(1) =3054a(2) =4624a(3) =4938a(4) =10704a(5) =19964a(6) =34396a(7) =76834a(8) =157770a(9) =319716a(10) =740790a(11) =1685004a(12) =3846896a(13) =9112670a(14) =21481768a(15) =50721208a(16) =121511664a(17) =290632366a(18) =695789488a(19) =1673868150a(20) =4026097838a(21) =9684997378a(22) =23347339456a(23) =56274247106a(24) =135653112384
External references
- oeis: A251917