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, 0, 1), (-1, 1, 1), (0, -1, 1), (0, 0, 1), (1, 0, -1)}.
A148352
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, 0, 1), (-1, 1, 1), (0, -1, 1), (0, 0, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =44a(6) =149a(7) =501a(8) =1812a(9) =6581a(10) =24978a(11) =95281a(12) =374307a(13) =1478152a(14) =5957632a(15) =24136130a(16) =99230460a(17) =409956275a(18) =1712308117a(19) =7184169355a(20) =30395781574a(21) =129128936429a(22) =552202998331
External references
- oeis: A148352