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, 1), (0, 1, -1), (0, 1, 1), (1, -1, 1)}.
A148915
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, 1), (0, 1, -1), (0, 1, 1), (1, -1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =32a(5) =110a(6) =444a(7) =1676a(8) =7090a(9) =28314a(10) =121990a(11) =504920a(12) =2212372a(13) =9382416a(14) =41584876a(15) =179539056a(16) =803135830a(17) =3514731918a(18) =15837959224a(19) =70054928916a(20) =317581225854
External references
- oeis: A148915