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), (0, -1, 1), (0, 1, -1), (1, 0, 0)}.
A148099
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), (0, -1, 1), (0, 1, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =10a(5) =26a(6) =76a(7) =223a(8) =702a(9) =2214a(10) =7304a(11) =24164a(12) =82489a(13) =282164a(14) =987881a(15) =3463409a(16) =12359141a(17) =44151318a(18) =159911910a(19) =579698430a(20) =2124693327a(21) =7792875067a(22) =28839353888a(23) =106787736502a(24) =398354778453
External references
- oeis: A148099