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

A266424

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

Terms

    a(0) =5a(1) =25a(2) =106a(3) =404a(4) =1391a(5) =4383a(6) =12758a(7) =34611a(8) =88206a(9) =212609a(10) =487630a(11) =1069664a(12) =2254259a(13) =4581719a(14) =9011222a(15) =17200214a(16) =31944220a(17) =57853902a(18) =102380657a(19) =177341666a(20) =301156443a(21) =502075951a(22) =822789263a(23) =1326908069a(24) =2107999291a(25) =3302022425

External references