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, 0), (-1, 1, -1), (1, 0, 1), (1, 1, 0)}.
A150149
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, 0), (-1, 1, -1), (1, 0, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =74a(5) =274a(6) =1103a(7) =4346a(8) =18145a(9) =74331a(10) =318312a(11) =1336411a(12) =5827832a(13) =24909882a(14) =110034713a(15) =476834165a(16) =2127342959a(17) =9318014380a(18) =41903405413a(19) =185131893648a(20) =837932888864
External references
- oeis: A150149