Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to or 1 greater than any north or northeast neighbors modulo 4 and the upper left element equal to 0.
A267558
Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to or 1 greater than any north or northeast neighbors modulo 4 and the upper left element equal to 0.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =61a(5) =350a(6) =2437a(7) =18530a(8) =145263a(9) =1156222a(10) =9288411a(11) =75111303a(12) =610606621a(13) =4987797081a(14) =40929379643a(15) =337321631621
External references
- oeis: A267558