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, 1), (0, 0, -1), (0, 1, -1), (1, 0, 1)}.
A149355
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, 1), (0, 0, -1), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =43a(5) =145a(6) =597a(7) =2275a(8) =9074a(9) =37089a(10) =156211a(11) =648877a(12) =2751041a(13) =11870673a(14) =51348956a(15) =222248568a(16) =975497005a(17) =4308619931a(18) =19026532763a(19) =84456709317a(20) =377858527555
External references
- oeis: A149355