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, 0), (1, -1, 0), (1, 0, -1), (1, 1, 1)}.
A149697
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, 0), (1, -1, 0), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =69a(5) =265a(6) =1153a(7) =4801a(8) =21203a(9) =91055a(10) =408161a(11) =1795037a(12) =8126131a(13) =36277181a(14) =165401729a(15) =746407191a(16) =3422278411a(17) =15570552767a(18) =71713302271a(19) =328341604021
External references
- oeis: A149697