Number of (4+1)X(n+1) 0..1 arrays with every 2X2 subblock sum nondecreasing horizontally, vertically and antidiagonally ne-to-sw.

A253329

Number of (4+1)X(n+1) 0..1 arrays with every 2X2 subblock sum nondecreasing horizontally, vertically and antidiagonally ne-to-sw.

Terms

    a(0) =286a(1) =848a(2) =2538a(3) =7744a(4) =23153a(5) =66196a(6) =185672a(7) =487946a(8) =1267072a(9) =3085862a(10) =7470280a(11) =17091282a(12) =39029883a(13) =84989350a(14) =185271083a(15) =388424614a(16) =817078868a(17) =1665997116a(18) =3414304408a(19) =6830298216a(20) =13751307597a(21) =27192582550a(22) =54155269965a(23) =106492298012

External references