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)}.
A149628
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) =5a(3) =15a(4) =67a(5) =251a(6) =1127a(7) =4585a(8) =20757a(9) =88181a(10) =401849a(11) =1752701a(12) =8029225a(13) =35639161a(14) =163961141a(15) =736853259a(16) =3401930559a(17) =15429614707a(18) =71448440479a(19) =326348903167
External references
- oeis: A149628