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, -1), (-1, 1, 0), (0, 1, -1), (1, 0, 1)}.
A149190
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, -1), (-1, 1, 0), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =37a(5) =131a(6) =463a(7) =1791a(8) =6833a(9) =26461a(10) =105324a(11) =418000a(12) =1684410a(13) =6836168a(14) =27822562a(15) =114359718a(16) =471222489a(17) =1949627785a(18) =8111429509a(19) =33814239567a(20) =141474465630a(21) =593788937120
External references
- oeis: A149190