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, 1, 0), (0, 0, -1), (1, 0, -1), (1, 1, 1)}.
A149683
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, 1, 0), (0, 0, -1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =67a(5) =261a(6) =1125a(7) =4807a(8) =21063a(9) =93087a(10) =418511a(11) =1895903a(12) =8658021a(13) =39797041a(14) =184054589a(15) =855402747a(16) =3992836245a(17) =18713274261a(18) =88014462373a(19) =415230430467
External references
- oeis: A149683