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, 0, 0), (0, -1, 1), (0, 0, -1), (1, 1, 0)}.
A149181
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, 0, 0), (0, -1, 1), (0, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =36a(5) =120a(6) =448a(7) =1630a(8) =6386a(9) =24438a(10) =98525a(11) =390708a(12) =1608407a(13) =6538477a(14) =27359803a(15) =113310781a(16) =480282169a(17) =2018226689a(18) =8644468533a(19) =36752277408a(20) =158790149990a(21) =681619870031
External references
- oeis: A149181