Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to or 1 greater than any west, northeast or northwest neighbors modulo 4 and the upper left element equal to 0.
A267426
Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to or 1 greater than any west, northeast or northwest neighbors modulo 4 and the upper left element equal to 0.
Terms
- a(0) =6a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =5a(8) =27a(9) =147a(10) =716a(11) =3088a(12) =11526a(13) =39526a(14) =124957a(15) =373857a(16) =1064784a(17) =2933131a(18) =7873273a(19) =20899636a(20) =55550356a(21) =150499069a(22) =422235945a(23) =1241600062a(24) =3831289921a(25) =12297881055a(26) =40444127432a(27) =134225228520a(28) =444175261116
External references
- oeis: A267426