Number of n X 2 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 1 or 2 neighboring 1s.
A296380
Number of n X 2 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 1 or 2 neighboring 1s.
Terms
- a(0) =2a(1) =10a(2) =28a(3) =86a(4) =279a(5) =869a(6) =2728a(7) =8596a(8) =27004a(9) =84888a(10) =266917a(11) =839085a(12) =2637906a(13) =8293166a(14) =26071968a(15) =81965142a(16) =257682603a(17) =810103353a(18) =2546806304a(19) =8006660936a(20) =25171373608a(21) =79133870240a(22) =248781395465a(23) =782119995913
External references
- oeis: A296380