Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row and column sum not 2 4 5 or 7 and every diagonal and antidiagonal sum 2 4 5 or 7.
A251871
Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row and column sum not 2 4 5 or 7 and every diagonal and antidiagonal sum 2 4 5 or 7.
Terms
- a(0) =3092a(1) =7160a(2) =7080a(3) =9936a(4) =18464a(5) =31296a(6) =40816a(7) =93176a(8) =140408a(9) =223728a(10) =450520a(11) =814232a(12) =1178736a(13) =2773304a(14) =4759928a(15) =7729200a(16) =17426968a(17) =32932952a(18) =51615984a(19) =125418104a(20) =233934776a(21) =383184048a(22) =922678360a(23) =1780892312a(24) =2888662896a(25) =7132898744
External references
- oeis: A251871