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, 1, -1), (0, 0, 1), (1, -1, -1), (1, 1, 0)}.
A149999
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, 1, -1), (0, 0, 1), (1, -1, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =17a(4) =59a(5) =214a(6) =833a(7) =3348a(8) =13757a(9) =57614a(10) =245029a(11) =1057097a(12) =4612119a(13) =20312134a(14) =90203785a(15) =403479671a(16) =1816531091a(17) =8225525396a(18) =37436630399a(19) =171169846195a(20) =785894026193
External references
- oeis: A149999