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), (1, 0, -1), (1, 1, 1)}.
A149505
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), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =11a(4) =47a(5) =143a(6) =577a(7) =2003a(8) =8189a(9) =29843a(10) =124731a(11) =468077a(12) =1982325a(13) =7615769a(14) =32504611a(15) =127166593a(16) =545613979a(17) =2165128349a(18) =9325666379a(19) =37427761149a(20) =161750060809a(21) =655060952797
External references
- oeis: A149505