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, 1, 0), (-1, 1, 1), (0, 0, -1), (1, 0, 1)}.
A149254
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, 1, 0), (-1, 1, 1), (0, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =11a(4) =38a(5) =138a(6) =518a(7) =1925a(8) =7440a(9) =29192a(10) =115792a(11) =463330a(12) =1871988a(13) =7607704a(14) =31111592a(15) =128013167a(16) =529225806a(17) =2195934042a(18) =9146666650a(19) =38235865902a(20) =160316046794a(21) =673972684288
External references
- oeis: A149254