Number of 3Xn 0..1 arrays with every element equal to 0, 1, 2, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
A303514
Number of 3Xn 0..1 arrays with every element equal to 0, 1, 2, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =4a(1) =25a(2) =78a(3) =230a(4) =801a(5) =2764a(6) =9367a(7) =31703a(8) =107876a(9) =366903a(10) =1247178a(11) =4239444a(12) =14413593a(13) =49004114a(14) =166604979a(15) =566429535a(16) =1925785826a(17) =6547430725a(18) =22260469676a(19) =75682984684a(20) =257313518769a(21) =874837061986
External references
- oeis: A303514