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, 0, 1), (1, -1, 0), (1, 1, -1)}.
A148453
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, 0, 1), (1, -1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =17a(5) =53a(6) =181a(7) =629a(8) =2273a(9) =8442a(10) =31903a(11) =123276a(12) =482016a(13) =1909749a(14) =7671004a(15) =31041259a(16) =126847637a(17) =522862741a(18) =2167729171a(19) =9053158292a(20) =38026043662a(21) =160503188086a(22) =681190257778
External references
- oeis: A148453