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, 0, 1), (0, 1, 0), (1, -1, -1), (1, 0, 0)}.
A149930
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, 0, 1), (0, 1, 0), (1, -1, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =48a(5) =171a(6) =637a(7) =2428a(8) =9550a(9) =38349a(10) =156705a(11) =650514a(12) =2730685a(13) =11586035a(14) =49633476a(15) =214245357a(16) =931290307a(17) =4073517547a(18) =17914555800a(19) =79177186936a(20) =351493613879
External references
- oeis: A149930