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, 0), (-1, 0, 1), (1, -1, 0), (1, 0, 1), (1, 1, -1)}.
A148994
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, 0), (-1, 0, 1), (1, -1, 0), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =33a(5) =116a(6) =458a(7) =1760a(8) =7255a(9) =29393a(10) =124655a(11) =521829a(12) =2256316a(13) =9664098a(14) =42389957a(15) =184646747a(16) =818911689a(17) =3612785095a(18) =16162919544a(19) =72022055993a(20) =324502937396
External references
- oeis: A148994