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, 0, -1), (0, -1, 1), (0, 1, 0), (1, -1, 0)}.
A148515
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, 0, -1), (0, -1, 1), (0, 1, 0), (1, -1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =5a(4) =17a(5) =38a(6) =135a(7) =355a(8) =1235a(9) =3663a(10) =12759a(11) =41129a(12) =142530a(13) =482153a(14) =1690291a(15) =5924589a(16) =21038783a(17) =75053348a(18) =270261312a(19) =980222917a(20) =3580325039a(21) =13122989221a(22) =48394036113a(23) =179255034705a(24) =667939329490
External references
- oeis: A148515