Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0) and consisting of n steps taken from {(-1, 0), (0, -1), (0, 1), (1, -1), (1, 1)}.
A151307
Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0) and consisting of n steps taken from {(-1, 0), (0, -1), (0, 1), (1, -1), (1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =9a(3) =34a(4) =151a(5) =659a(6) =2999a(7) =13714a(8) =63799a(9) =298397a(10) =1408415a(11) =6678827a(12) =31841195a(13) =152374091a(14) =731802083a(15) =3524706626a(16) =17021524103a(17) =82383673241a(18) =399539775647
External references
- oeis: A151307