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, 0, 0), (0, -1, 1), (0, 0, 1), (1, -1, 0), (1, 1, -1)}.
A148475
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, 0, 0), (0, -1, 1), (0, 0, 1), (1, -1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =20a(5) =67a(6) =236a(7) =878a(8) =3371a(9) =13228a(10) =52874a(11) =214793a(12) =885291a(13) =3692585a(14) =15554663a(15) =66101794a(16) =283128271a(17) =1221159525a(18) =5299556530a(19) =23126058386a(20) =101422704683a(21) =446830641450
External references
- oeis: A148475