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), (0, 0, -1), (1, 0, 1)}.
A149243
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), (0, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =11a(4) =36a(5) =125a(6) =453a(7) =1643a(8) =6188a(9) =23609a(10) =91127a(11) =355475a(12) =1402336a(13) =5573671a(14) =22297494a(15) =89782237a(16) =363634796a(17) =1479469837a(18) =6045872801a(19) =24810245469a(20) =102175595798a(21) =422157858039
External references
- oeis: A149243