Number of n X 4 binary arrays with rows lexicographically nondecreasing and columns lexicographically nondecreasing and row sums nondecreasing and column sums nonincreasing.

A266931

Number of n X 4 binary arrays with rows lexicographically nondecreasing and columns lexicographically nondecreasing and row sums nondecreasing and column sums nonincreasing.

Terms

    a(0) =2a(1) =5a(2) =12a(3) =35a(4) =100a(5) =288a(6) =794a(7) =2077a(8) =5110a(9) =11869a(10) =26086a(11) =54543a(12) =108999a(13) =209148a(14) =386883a(15) =692473a(16) =1203061a(17) =2034487a(18) =3357115a(19) =5416951a(20) =8563297a(21) =13284702a(22) =20254831a(23) =30390893a(24) =44926915a(25) =65505045a(26) =94288435a(27) =134099783a(28) =188589873a(29) =262441858

External references