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), (0, 0, 1), (0, 1, -1), (1, -1, -1)}.
A148018
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), (0, 0, 1), (0, 1, -1), (1, -1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =8a(5) =17a(6) =46a(7) =120a(8) =345a(9) =1022a(10) =2910a(11) =9040a(12) =27530a(13) =88493a(14) =283253a(15) =912384a(16) =3037696a(17) =9955390a(18) =33803098a(19) =113920402a(20) =390162517a(21) =1349732321a(22) =4642227231a(23) =16328414313a(24) =56978655042a(25) =202131478689a(26) =717829790091
External references
- oeis: A148018