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, -1, -1), (1, 1, 1)}.
A149501
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, -1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =9a(4) =45a(5) =121a(6) =521a(7) =1757a(8) =7273a(9) =26229a(10) =110901a(11) =408221a(12) =1748925a(13) =6649037a(14) =28453805a(15) =111004789a(16) =477102029a(17) =1882048601a(18) =8147322225a(19) =32485684073a(20) =140960817957a(21) =568975900137
External references
- oeis: A149501