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

A266358

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

Terms

    a(0) =5a(1) =22a(2) =82a(3) =276a(4) =830a(5) =2278a(6) =5752a(7) =13525a(8) =29864a(9) =62455a(10) =124501a(11) =237951a(12) =438085a(13) =780124a(14) =1348276a(15) =2268306a(16) =3724141a(17) =5980163a(18) =9410094a(19) =14534556a(20) =22068734a(21) =32983206a(22) =48579531a(23) =70584895a(24) =101268301a(25) =143583339a(26) =201341148a(27) =279420500a(28) =384018844

External references