Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 0), (-1, 1, 1), (1, 0, -1), (1, 1, 1)}.
A149637
Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 0), (-1, 1, 1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =69a(5) =233a(6) =1129a(7) =4199a(8) =20497a(9) =79999a(10) =393337a(11) =1587219a(12) =7839313a(13) =32394061a(14) =160417755a(15) =674712045a(16) =3348230713a(17) =14279003203a(18) =70960206451a(19) =305991943993
External references
- oeis: A149637