Number of (2+2)X(n+2) 0..1 arrays with every 3X3 subblock diagonal sum plus antidiagonal median nondecreasing horizontally, vertically and ne-to-sw antidiagonally.

A254021

Number of (2+2)X(n+2) 0..1 arrays with every 3X3 subblock diagonal sum plus antidiagonal median nondecreasing horizontally, vertically and ne-to-sw antidiagonally.

Terms

    a(0) =2540a(1) =7212a(2) =23295a(3) =81959a(4) =261188a(5) =806538a(6) =2368198a(7) =6624259a(8) =17894542a(9) =46475759a(10) =117362361a(11) =289972349a(12) =700430787a(13) =1660287016a(14) =3874041941a(15) =8916784297a(16) =20277482009a(17) =45635984351a(18) =101763767073a(19) =225107832296a(20) =494489541033

External references