Number of nX5 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X6 binary array having a sum of three or less, with rows and columns of the latter in lexicographically nondecreasing order.
A227268
Number of nX5 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X6 binary array having a sum of three or less, with rows and columns of the latter in lexicographically nondecreasing order.
Terms
- a(0) =6a(1) =54a(2) =341a(3) =1949a(4) =10906a(5) =59952a(6) =311644a(7) =1513042a(8) =6877791a(9) =29429777a(10) =119153363a(11) =458571762a(12) =1684448300a(13) =5926680882a(14) =20037283285a(15) =65276341407a(16) =205423183265a(17) =625887083947
External references
- oeis: A227268