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, 0, 0), (-1, 0, 1), (0, -1, 0), (0, 1, -1), (1, 1, 0)}.
A149326
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, 0, 0), (-1, 0, 1), (0, -1, 0), (0, 1, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =38a(5) =143a(6) =527a(7) =1977a(8) =7851a(9) =31110a(10) =125198a(11) =515302a(12) =2125456a(13) =8872634a(14) =37425969a(15) =158422833a(16) =676318450a(17) =2903753155a(18) =12514755832a(19) =54252313270a(20) =236067482292
External references
- oeis: A149326