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, 0, 1), (1, -1, 0), (1, 1, 0)}.
A149140
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, 0, 1), (1, -1, 0), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =9a(4) =36a(5) =110a(6) =440a(7) =1485a(8) =6138a(9) =21902a(10) =92050a(11) =339946a(12) =1446888a(13) =5494374a(14) =23538850a(15) =91150203a(16) =392888970a(17) =1545871468a(18) =6689452848a(19) =26641201900a(20) =115706733198a(21) =465593151464
External references
- oeis: A149140