Number of nX4 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X5 binary array having a sum of two, with rows and columns of the latter in lexicographically nondecreasing order.
A227101
Number of nX4 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X5 binary array having a sum of two, with rows and columns of the latter in lexicographically nondecreasing order.
Terms
- a(0) =11a(1) =136a(2) =1084a(3) =8427a(4) =60039a(5) =384591a(6) =2209056a(7) =11456481a(8) =54141062a(9) =235262503a(10) =947783225a(11) =3566095007a(12) =12613787982a(13) =42187331840a(14) =134097083832a(15) =406916965311
External references
- oeis: A227101