Number of nX3 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X4 binary array having a sum of two, with rows and columns of the latter in lexicographically nondecreasing order.

A227100

Number of nX3 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X4 binary array having a sum of two, with rows and columns of the latter in lexicographically nondecreasing order.

Terms

    a(0) =7a(1) =48a(2) =239a(3) =1084a(4) =4444a(5) =16366a(6) =54500a(7) =166271a(8) =470106a(9) =1243205a(10) =3098315a(11) =7323392a(12) =16507967a(13) =35657274a(14) =74111642a(15) =148760250a(16) =289286122a(17) =546530516a(18) =1005554661a(19) =1805649489a(20) =3170455197a(21) =5452571146a(22) =9198647584a(23) =15243057393a(24) =24840973642

External references