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

A227676

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

Terms

    a(0) =7a(1) =50a(2) =283a(3) =1343a(4) =5434a(5) =19188a(6) =60484a(7) =173433a(8) =459198a(9) =1135975a(10) =2650373a(11) =5876032a(12) =12455509a(13) =25370717a(14) =49868689a(15) =94927157a(16) =175523369a(17) =316075856a(18) =555569995a(19) =955063241a(20) =1608505660a(21) =2658118770a(22) =4315965894a(23) =6893838077a(24) =10844191896

External references