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, 1), (1, -1, 0), (1, 0, -1), (1, 0, 0)}.
A148747
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, 1), (1, -1, 0), (1, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =27a(5) =87a(6) =361a(7) =1319a(8) =5715a(9) =22521a(10) =100367a(11) =415235a(12) =1886385a(13) =8073371a(14) =37195897a(15) =163184991a(16) =759886449a(17) =3397005989a(18) =15951150479a(19) =72362430593a(20) =342075234779
External references
- oeis: A148747