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, 0, 1), (0, 1, -1), (1, -1, -1), (1, 1, 0)}.
A148687
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, 0, 1), (0, 1, -1), (1, -1, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =22a(5) =67a(6) =228a(7) =775a(8) =2787a(9) =10126a(10) =37764a(11) =143329a(12) =550368a(13) =2149095a(14) =8453575a(15) =33691399a(16) =135090849a(17) =547090691a(18) =2227753448a(19) =9139576254a(20) =37693231937a(21) =156318494839a(22) =651542940226
External references
- oeis: A148687