Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 2 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 2 3 4 6 or 7.

A252160

Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 2 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 2 3 4 6 or 7.

Terms

    a(0) =2581a(1) =3712a(2) =5025a(3) =7570a(4) =12522a(5) =21186a(6) =37337a(7) =68096a(8) =124387a(9) =231325a(10) =437943a(11) =826729a(12) =1573451a(13) =3026541a(14) =5799316a(15) =11168884a(16) =21666676a(17) =41896587a(18) =81298755a(19) =158474687a(20) =308340366a(21) =601219256a(22) =1175888798a(23) =2297341782a(24) =4494637959a(25) =8811577756

External references