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), (0, 0, 1), (1, -1, 1), (1, 1, -1)}.
A148470
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), (0, 0, 1), (1, -1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =19a(5) =67a(6) =256a(7) =1009a(8) =4142a(9) =17414a(10) =74809a(11) =326561a(12) =1445537a(13) =6471269a(14) =29249189a(15) =133290846a(16) =611705691a(17) =2824538309a(18) =13112342280a(19) =61160095004a(20) =286468978496
External references
- oeis: A148470