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, 0), (-1, 0, 1), (1, -1, 1), (1, 1, -1), (1, 1, 0)}.
A149474
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, 0), (-1, 0, 1), (1, -1, 1), (1, 1, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =13a(4) =56a(5) =217a(6) =1007a(7) =4323a(8) =20408a(9) =91485a(10) =440772a(11) =2039543a(12) =9903272a(13) =46648424a(14) =228365295a(15) =1090701055a(16) =5361007008a(17) =25835934259a(18) =127498368909a(19) =618915161987
External references
- oeis: A149474