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

A266465

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

Terms

    a(0) =2a(1) =5a(2) =12a(3) =29a(4) =67a(5) =147a(6) =303a(7) =590a(8) =1090a(9) =1922a(10) =3253a(11) =5311a(12) =8400a(13) =12918a(14) =19377a(15) =28425a(16) =40873a(17) =57722a(18) =80196a(19) =109776a(20) =148240a(21) =197703a(22) =260666a(23) =340063a(24) =439318a(25) =562401a(26) =713894a(27) =899055a(28) =1123895a(29) =1395251

External references