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, -1), (-1, -1, 1), (-1, 1, 1), (1, 0, 0), (1, 1, -1)}.
A148274
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, -1), (-1, -1, 1), (-1, 1, 1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =15a(5) =40a(6) =156a(7) =477a(8) =1997a(9) =6657a(10) =28924a(11) =101735a(12) =451962a(13) =1652731a(14) =7473701a(15) =28162223a(16) =128976650a(17) =497426810a(18) =2300644619a(19) =9040435627a(20) =42147544049a(21) =168202296082a(22) =789247856960
External references
- oeis: A148274