Number of 2*n X 4 binary arrays with row sums 2 and column sums n, avoiding the patterns 010 and 101 in any row and column.
A381551
Number of 2*n X 4 binary arrays with row sums 2 and column sums n, avoiding the patterns 010 and 101 in any row and column.
Terms
- a(0) =1a(1) =4a(2) =16a(3) =64a(4) =324a(5) =1764a(6) =10000a(7) =58564a(8) =350464a(9) =2131600a(10) =13133376a(11) =81757764a(12) =513294336a(13) =3245580900a(14) =20646241344a(15) =132021769104a(16) =848031024996
External references
- oeis: A381551