Number of (n+2) X (2+2) 0..3 arrays with every 3 X 3 subblock row and diagonal sum equal to 0, 2, 5, 6 or 7 and every 3 X 3 column and antidiagonal sum not equal to 0, 2, 5, 6 or 7.

A252673

Number of (n+2) X (2+2) 0..3 arrays with every 3 X 3 subblock row and diagonal sum equal to 0, 2, 5, 6 or 7 and every 3 X 3 column and antidiagonal sum not equal to 0, 2, 5, 6 or 7.

Terms

    a(0) =775a(1) =630a(2) =991a(3) =1677a(4) =3573a(5) =7164a(6) =13494a(7) =30552a(8) =63153a(9) =121564a(10) =279871a(11) =585918a(12) =1135346a(13) =2626993a(14) =5528908a(15) =10742509a(16) =24904376a(17) =52533179a(18) =102187158a(19) =237103008a(20) =500642761a(21) =974327011a(22) =2261578642a(23) =4777472917a(24) =9299731171a(25) =21589972325

External references