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

A252428

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

Terms

    a(0) =1142a(1) =1033a(2) =1810a(3) =3954a(4) =9643a(5) =24024a(6) =59977a(7) =153283a(8) =389066a(9) =994207a(10) =2583468a(11) =6641473a(12) =17166060a(13) =45035698a(14) =116572494a(15) =303313550a(16) =800157489a(17) =2078949610a(18) =5429352825a(19) =14366800297a(20) =37404613287a(21) =97882351085a(22) =259440365356

External references