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, 0, 0), (1, -1, -1), (1, 0, 0), (1, 1, 0)}.
A150302
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, 0, 0), (1, -1, -1), (1, 0, 0), (1, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =21a(4) =80a(5) =281a(6) =1138a(7) =4369a(8) =18302a(9) =73789a(10) =315759a(11) =1314708a(12) =5718763a(13) =24368034a(14) =107302457a(15) =464979845a(16) =2066691614a(17) =9071525567a(18) =40625817135a(19) =180148052526a(20) =811809392966
External references
- oeis: A150302