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, 1), (0, 1, -1), (1, -1, 0), (1, 1, 1)}.
A149616
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, 1), (0, 1, -1), (1, -1, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =63a(5) =253a(6) =1061a(7) =4595a(8) =19987a(9) =88995a(10) =399063a(11) =1807047a(12) =8258631a(13) =37926009a(14) =175439373a(15) =814974117a(16) =3803353317a(17) =17823043081a(18) =83783555447a(19) =395225398493
External references
- oeis: A149616