Number of n X 3 0,1 arrays indicating 2 X 2 subblocks of some larger (n+1) X 4 binary array having two adjacent 1's and two adjacent 0's, with rows and columns of the latter in lexicographically nondecreasing order.
A227330
Number of n X 3 0,1 arrays indicating 2 X 2 subblocks of some larger (n+1) X 4 binary array having two adjacent 1's and two adjacent 0's, with rows and columns of the latter in lexicographically nondecreasing order.
Terms
- a(0) =8a(1) =34a(2) =153a(3) =708a(4) =3013a(5) =11292a(6) =37312a(7) =110816a(8) =301923a(9) =766340a(10) =1832683a(11) =4164473a(12) =9050350a(13) =18908103a(14) =38136118a(15) =74516301a(16) =141474093a(17) =261645212a(18) =472399946a(19) =834253036a(20) =1443464344a(21) =2450642643a(22) =4087839408a(23) =6707507638a(24) =10837859135
External references
- oeis: A227330