Number of 3Xn 0..1 arrays with every element equal to 1, 2 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero.
A301952
Number of 3Xn 0..1 arrays with every element equal to 1, 2 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =0a(1) =5a(2) =20a(3) =123a(4) =680a(5) =4070a(6) =23565a(7) =138014a(8) =805249a(9) =4704141a(10) =27469522a(11) =160428571a(12) =936897912a(13) =5471539885a(14) =31953953498a(15) =186612354231
External references
- oeis: A301952