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, 0), (-1, 1, 1), (0, 1, -1), (1, 0, 1), (1, 1, -1)}.
A149466
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, 0), (-1, 1, 1), (0, 1, -1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =13a(4) =53a(5) =204a(6) =874a(7) =3723a(8) =16387a(9) =72446a(10) =326215a(11) =1477841a(12) =6760897a(13) =31103660a(14) =144014155a(15) =669926435a(16) =3130656530a(17) =14684820342a(18) =69123314399a(19) =326358901691
External references
- oeis: A149466