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

A227099

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

Terms

    a(0) =4a(1) =15a(2) =48a(3) =136a(4) =341a(5) =771a(6) =1606a(7) =3133a(8) =5789a(9) =10214a(10) =17315a(11) =28342a(12) =44977a(13) =69437a(14) =104592a(15) =154099a(16) =222553a(17) =315656a(18) =440405a(19) =605300a(20) =820573a(21) =1098439a(22) =1453370a(23) =1902393a(24) =2465413a(25) =3165562a(26) =4029575a(27) =5088194a(28) =6376601a(29) =7934881

External references