Number of nX4 binary arrays with rows and columns lexicographically nondecreasing and column sums nonincreasing.

A266466

Number of nX4 binary arrays with rows and columns lexicographically nondecreasing and column sums nonincreasing.

Terms

    a(0) =2a(1) =6a(2) =19a(3) =66a(4) =232a(5) =794a(6) =2574a(7) =7797a(8) =22058a(9) =58469a(10) =146027a(11) =345578a(12) =779240a(13) =1682359a(14) =3492869a(15) =6999952a(16) =13585959a(17) =25610002a(18) =47004982a(19) =84187248a(20) =147421139a(21) =252829908a(22) =425319569a(23) =702767285a(24) =1141951244a(25) =1826839569a(26) =2880058656a(27) =4478585700

External references