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, 0, 1), (-1, 1, 1), (0, -1, 1), (0, 1, 0), (1, 1, -1)}.
A148212
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, 0, 1), (-1, 1, 1), (0, -1, 1), (0, 1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =12a(5) =37a(6) =129a(7) =463a(8) =1739a(9) =6714a(10) =26604a(11) =107525a(12) =442184a(13) =1844112a(14) =7785086a(15) =33204662a(16) =142898151a(17) =619768375a(18) =2706503596a(19) =11890979967a(20) =52525690191a(21) =233144640014
External references
- oeis: A148212