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, 1), (0, 1, -1), (1, 0, 1), (1, 1, -1)}.
A149470
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, 1), (0, 1, -1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =13a(4) =55a(5) =205a(6) =922a(7) =3801a(8) =17604a(9) =76293a(10) =359387a(11) =1607949a(12) =7658582a(13) =35020548a(14) =168084270a(15) =780609843a(16) =3767705112a(17) =17699998379a(18) =85797866064a(19) =406619443584
External references
- oeis: A149470