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, 0, 1), (0, 1, 0), (1, -1, 0), (1, 1, -1)}.
A148305
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, 0, 1), (0, 1, 0), (1, -1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =13a(5) =39a(6) =127a(7) =425a(8) =1508a(9) =5564a(10) =20962a(11) =81250a(12) =322242a(13) =1298027a(14) =5313358a(15) =22075715a(16) =92778080a(17) =394026108a(18) =1690459141a(19) =7315000807a(20) =31892994079a(21) =140059021519a(22) =619096017277
External references
- oeis: A148305