T(n,k) = Number of n X k 0..2 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors.

A203460

T(n,k) = Number of n X k 0..2 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =1a(6) =1a(7) =9a(8) =9a(9) =1a(10) =1a(11) =22a(12) =84a(13) =22a(14) =1a(15) =1a(16) =63a(17) =543a(18) =543a(19) =63a(20) =1a(21) =1a(22) =209a(23) =3748a(24) =8837a(25) =3748a(26) =209a(27) =1a(28) =1a(29) =686

External references