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), (-1, 1, 1), (1, -1, 0), (1, 0, 0)}.
A148276
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), (-1, 1, 1), (1, -1, 0), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =15a(5) =40a(6) =159a(7) =477a(8) =2016a(9) =6604a(10) =28654a(11) =98524a(12) =441362a(13) =1589742a(14) =7194148a(15) =26618448a(16) =122581435a(17) =466287564a(18) =2160255214a(19) =8362582609a(20) =39159600970a(21) =154410225878a(22) =725934373768
External references
- oeis: A148276