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, 0), (-1, 0, 1), (1, 0, -1), (1, 1, 1)}.
A149635
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, 0), (-1, 0, 1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =69a(5) =233a(6) =1123a(7) =4193a(8) =20365a(9) =79577a(10) =389657a(11) =1576461a(12) =7753541a(13) =32101097a(14) =158408649a(15) =667616317a(16) =3302236011a(17) =14108958387a(18) =69912164165a(19) =302004643089
External references
- oeis: A149635