Number of (n+1)X3 0..1 arrays with the sums of 2X2 subblocks nondecreasing rightwards and downwards.

A204033

Number of (n+1)X3 0..1 arrays with the sums of 2X2 subblocks nondecreasing rightwards and downwards.

Terms

    a(0) =44a(1) =164a(2) =603a(3) =1758a(4) =5130a(5) =13040a(6) =33223a(7) =77574a(8) =181559a(9) =401370a(10) =889157a(11) =1896644a(12) =4052667a(13) =8444892a(14) =17621165a(15) =36165014a(16) =74299430a(17) =151007392a(18) =307137335a(19) =620376066a(20) =1253727656a(21) =2522563936a(22) =5077320907a(23) =10191401694a(24) =20461362545

External references