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

A266937

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

Terms

    a(0) =5a(1) =12a(2) =20a(3) =35a(4) =52a(5) =82a(6) =115a(7) =169a(8) =232a(9) =322a(10) =426a(11) =573a(12) =738a(13) =961a(14) =1215a(15) =1543a(16) =1912a(17) =2382a(18) =2905a(19) =3557a(20) =4280a(21) =5161a(22) =6135a(23) =7308a(24) =8594a(25) =10120a(26) =11791a(27) =13749a(28) =15883a(29) =18361

External references