Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,2,1,1,1 for x=0,1,2,3,4.
A197539
Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,2,1,1,1 for x=0,1,2,3,4.
Terms
- a(0) =1a(1) =5a(2) =8a(3) =19a(4) =28a(5) =58a(6) =119a(7) =219a(8) =395a(9) =776a(10) =1529a(11) =2826a(12) =5300a(13) =10299a(14) =19763a(15) =37051a(16) =70380a(17) =135411a(18) =257788a(19) =487412a(20) =929135a(21) =1776855a(22) =3377845a(23) =6414026a(24) =12229725a(25) =23320560a(26) =44346952a(27) =84364697a(28) =160777089a(29) =306229857
External references
- oeis: A197539