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, 1), (-1, 0, 1), (0, 0, -1), (0, 1, 0), (1, -1, 1)}.
A148391
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, 1), (-1, 0, 1), (0, 0, -1), (0, 1, 0), (1, -1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =16a(5) =52a(6) =170a(7) =581a(8) =2082a(9) =7647a(10) =28508a(11) =107906a(12) =414484a(13) =1611854a(14) =6332018a(15) =25103351a(16) =100354887a(17) =404032355a(18) =1636789195a(19) =6669626502a(20) =27324758600a(21) =112493883858a(22) =465159225696
External references
- oeis: A148391