Number of n X 4 0..1 arrays with each 1 horizontally or vertically adjacent to 2 or 3 1's.
A295209
Number of n X 4 0..1 arrays with each 1 horizontally or vertically adjacent to 2 or 3 1's.
Terms
- a(0) =1a(1) =7a(2) =27a(3) =147a(4) =916a(5) =4938a(6) =27208a(7) =152236a(8) =848992a(9) =4746938a(10) =26555583a(11) =148468255a(12) =830063597a(13) =4640855585a(14) =25946470239a(15) =145065530889a(16) =811058197498
External references
- oeis: A295209