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, -1, 0), (-1, 0, 1), (1, 0, 0), (1, 1, 0)}.
A150308
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, -1, 0), (-1, 0, 1), (1, 0, 0), (1, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =21a(4) =84a(5) =293a(6) =1240a(7) =4656a(8) =20363a(9) =80023a(10) =357202a(11) =1447365a(12) =6552397a(13) =27145352a(14) =124153417a(15) =523071534a(16) =2410975045a(17) =10293066163a(18) =47732356116a(19) =205975042397a(20) =959841636269
External references
- oeis: A150308