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, 0), (0, 0, -1), (1, -1, 1), (1, 0, 1)}.
A148820
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, 0), (0, 0, -1), (1, -1, 1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =26a(5) =92a(6) =327a(7) =1177a(8) =4546a(9) =17541a(10) =68673a(11) =277081a(12) =1120356a(13) =4568417a(14) =18983023a(15) =79045293a(16) =331103647a(17) =1404169545a(18) =5966973556a(19) =25469309886a(20) =109652366558a(21) =472967585532
External references
- oeis: A148820