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, 1), (-1, 1, 1), (1, 0, 1), (1, 1, -1)}.
A149421
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, 1), (-1, 1, 1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =56a(5) =194a(6) =936a(7) =3538a(8) =17321a(9) =68903a(10) =339902a(11) =1396514a(12) =6919349a(13) =29062278a(14) =144387889a(15) =616244809a(16) =3067086814a(17) =13251144642a(18) =66031397048a(19) =288051494440
External references
- oeis: A149421