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

A266423

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

Terms

    a(0) =4a(1) =14a(2) =39a(3) =96a(4) =212a(5) =433a(6) =826a(7) =1493a(8) =2575a(9) =4270a(10) =6841a(11) =10639a(12) =16114a(13) =23845a(14) =34555a(15) =49147a(16) =68725a(17) =94637a(18) =128501a(19) =172257a(20) =228199a(21) =299035a(22) =387927a(23) =498560a(24) =635189a(25) =802719a(26) =1006760a(27) =1253717a(28) =1550855a(29) =1906400

External references