1/12 the number of (n+2) X 4 0..2 arrays with each 3 X 3 subblock containing three of each value.
A184379
1/12 the number of (n+2) X 4 0..2 arrays with each 3 X 3 subblock containing three of each value.
Terms
- a(0) =545a(1) =1494a(2) =4281a(3) =13616a(4) =55386a(5) =242370a(6) =1165496a(7) =6248040a(8) =34487190a(9) =195981866a(10) =1145052186a(11) =6737361360a(12) =39912443060a(13) =237978427224
External references
- oeis: A184379