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, 0), (1, 1, -1), (1, 1, 0), (1, 1, 1)}.
A150931
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, 0), (1, 1, -1), (1, 1, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =9a(3) =33a(4) =153a(5) =636a(6) =3007a(7) =13250a(8) =63327a(9) =288054a(10) =1386855a(11) =6435925a(12) =31148163a(13) =146526132a(14) =711937705a(15) =3381965649a(16) =16482630633a(17) =78873855946a(18) =385353116887
External references
- oeis: A150931