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, 0, 0), (1, -1, 0), (1, 1, -1), (1, 1, 0)}.
A149192
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, 0, 0), (1, -1, 0), (1, 1, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =38a(5) =123a(6) =493a(7) =1807a(8) =7496a(9) =29400a(10) =125564a(11) =514621a(12) =2245001a(13) =9488604a(14) =42075089a(15) =181941417a(16) =817228089a(17) =3596501357a(18) =16322969441a(19) =72842426204a(20) =333437372040
External references
- oeis: A149192