Number of n X 2 binary arrays indicating whether each 2 X 2 subblock of a larger binary array has lexicographically increasing rows and columns, for some larger (n+1) X 3 binary array with rows and columns of the latter in lexicographically nondecreasing order.
A227085
Number of n X 2 binary arrays indicating whether each 2 X 2 subblock of a larger binary array has lexicographically increasing rows and columns, for some larger (n+1) X 3 binary array with rows and columns of the latter in lexicographically nondecreasing order.
Terms
- a(0) =4a(1) =12a(2) =29a(3) =62a(4) =122a(5) =225a(6) =393a(7) =655a(8) =1048a(9) =1618a(10) =2421a(11) =3524a(12) =5006a(13) =6959a(14) =9489a(15) =12717a(16) =16780a(17) =21832a(18) =28045a(19) =35610a(20) =44738a(21) =55661a(22) =68633a(23) =83931a(24) =101856a(25) =122734a(26) =146917a(27) =174784a(28) =206742a(29) =243227
External references
- oeis: A227085