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

A252314

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

Terms

    a(0) =1557a(1) =2498a(2) =4197a(3) =7815a(4) =15269a(5) =28883a(6) =56052a(7) =111752a(8) =222145a(9) =444181a(10) =897077a(11) =1806148a(12) =3657416a(13) =7450174a(14) =15181961a(15) =31018187a(16) =63563988a(17) =130459945a(18) =268427476a(19) =553464891a(20) =1142966125a(21) =2364860929a(22) =4901856593a(23) =10176932382a(24) =21164686115

External references