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, 0), (1, -1, 0), (1, -1, 1), (1, 0, -1), (1, 1, 0)}.
A149346
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, 0), (1, -1, 0), (1, -1, 1), (1, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =42a(5) =149a(6) =568a(7) =2172a(8) =8578a(9) =34181a(10) =139057a(11) =569719a(12) =2364946a(13) =9881270a(14) =41674337a(15) =176735488a(16) =754733091a(17) =3238354312a(18) =13970248201a(19) =60513360263a(20) =263262526696
External references
- oeis: A149346