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, 0), (-1, -1, 1), (-1, 0, 1), (1, 0, 1), (1, 1, -1)}.
A149001
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, 0), (-1, -1, 1), (-1, 0, 1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =34a(5) =115a(6) =468a(7) =1742a(8) =7367a(9) =29009a(10) =126186a(11) =513867a(12) =2277350a(13) =9497955a(14) =42648196a(15) =181076473a(16) =821244559a(17) =3535010078a(18) =16157583043a(19) =70311352314a(20) =323360554529
External references
- oeis: A149001