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), (0, 1, 0), (1, 0, 1)}.
A150250
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), (0, 1, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =22a(4) =85a(5) =339a(6) =1395a(7) =5878a(8) =25192a(9) =109323a(10) =479306a(11) =2119594a(12) =9440676a(13) =42302795a(14) =190529094a(15) =861966149a(16) =3914794199a(17) =17840793760a(18) =81552762664a(19) =373801093673
External references
- oeis: A150250