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, 0), (-1, 1, -1), (0, -1, 1), (1, 1, 0)}.
A149185
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, 0), (-1, 1, -1), (0, -1, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =36a(5) =125a(6) =454a(7) =1716a(8) =6593a(9) =25701a(10) =102083a(11) =408319a(12) =1651891a(13) =6730414a(14) =27610680a(15) =113907332a(16) =472370273a(17) =1967168204a(18) =8225197054a(19) =34508435173a(20) =145232346024a(21) =612927899755
External references
- oeis: A149185