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), (0, 1, -1), (0, 1, 0), (1, 0, 1)}.
A149959
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), (0, 1, -1), (0, 1, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =16a(4) =54a(5) =180a(6) =634a(7) =2288a(8) =8237a(9) =30257a(10) =112414a(11) =417790a(12) =1568921a(13) =5928140a(14) =22414805a(15) =85285035a(16) =325751694a(17) =1245081641a(18) =4778408244a(19) =18387308367a(20) =70800124423a(21) =273382643467
External references
- oeis: A149959