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, 0), (-1, 0, -1), (1, -1, 0), (1, 1, 1)}.
A149504
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, 0), (-1, 0, -1), (1, -1, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =11a(4) =47a(5) =143a(6) =577a(7) =2003a(8) =8189a(9) =29843a(10) =124237a(11) =467583a(12) =1960681a(13) =7577163a(14) =31962501a(15) =125734635a(16) =534229159a(17) =2128096227a(18) =9092397583a(19) =36615310761a(20) =157023171309a(21) =638232284475
External references
- oeis: A149504