Number of nX4 0..1 arrays with every element equal to 1, 2 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
A302220
Number of nX4 0..1 arrays with every element equal to 1, 2 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =2a(1) =45a(2) =164a(3) =934a(4) =4237a(5) =21777a(6) =105585a(7) =523414a(8) =2578424a(9) =12726069a(10) =62802085a(11) =309849336a(12) =1529212139a(13) =7545987106a(14) =37239443170a(15) =183771070484a(16) =906898467298
External references
- oeis: A302220