Number of n X 3 0,1 arrays indicating 2 X 2 subblocks of some larger (n+1) X 4 binary array having a sum of one or less, with rows and columns of the latter in lexicographically nondecreasing order.

A227162

Number of n X 3 0,1 arrays indicating 2 X 2 subblocks of some larger (n+1) X 4 binary array having a sum of one or less, with rows and columns of the latter in lexicographically nondecreasing order.

Terms

    a(0) =4a(1) =18a(2) =62a(3) =193a(4) =558a(5) =1507a(6) =3828a(7) =9149a(8) =20609a(9) =43918a(10) =88960a(11) =172130a(12) =319637a(13) =572050a(14) =990413a(15) =1664308a(16) =2722302a(17) =4345275a(18) =6783191a(19) =10375943a(20) =15578976a(21) =22994469a(22) =33408938a(23) =47838207a(24) =67580783a(25) =94280764a(26) =130001506a(27) =177311376a(28) =239383023

External references