Number of n X 3 binary arrays with rows and columns lexicographically nondecreasing and row and column sums nondecreasing.

A266357

Number of n X 3 binary arrays with rows and columns lexicographically nondecreasing and row and column sums nondecreasing.

Terms

    a(0) =4a(1) =13a(2) =35a(3) =82a(4) =173a(5) =337a(6) =614a(7) =1060a(8) =1749a(9) =2777a(10) =4266a(11) =6369a(12) =9273a(13) =13206a(14) =18441a(15) =25302a(16) =34170a(17) =45490a(18) =59776a(19) =77620a(20) =99698a(21) =126778a(22) =159728a(23) =199525a(24) =247262a(25) =304159a(26) =371571a(27) =450998a(28) =544095a(29) =652683

External references