Number of (1+2) X (n+2) arrays of permutations of 0..n*3+5 filled by rows with each element moved 0 or 1 knight moves, and rows and columns in increasing lexicographic order.
A263956
Number of (1+2) X (n+2) arrays of permutations of 0..n*3+5 filled by rows with each element moved 0 or 1 knight moves, and rows and columns in increasing lexicographic order.
Terms
- a(0) =6a(1) =40a(2) =118a(3) =354a(4) =1209a(5) =4334a(6) =14525a(7) =46022a(8) =141006a(9) =427611a(10) =1270118a(11) =3707059a(12) =10650367a(13) =30235396a(14) =84926968a(15) =236340047a(16) =652236286a(17) =1787173735a(18) =4866827711a(19) =13182285189a(20) =35538045627a(21) =95417738007a(22) =255294004187a(23) =680978483881
External references
- oeis: A263956