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, 0), (-1, -1, 1), (-1, 1, -1), (0, 0, 1), (1, 0, -1)}.
A148004
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, 0), (-1, -1, 1), (-1, 1, -1), (0, 0, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =8a(5) =15a(6) =39a(7) =97a(8) =302a(9) =817a(10) =2435a(11) =7105a(12) =21500a(13) =63697a(14) =206038a(15) =663263a(16) =2159140a(17) =6975073a(18) =23040857a(19) =75117391a(20) =251186106a(21) =855285955a(22) =2942402740a(23) =10063076773a(24) =34691521836a(25) =119449516957a(26) =413353318719
External references
- oeis: A148004