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, 1), (0, 0, 1), (0, 1, 0), (1, 1, -1)}.
A149892
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, 1), (0, 0, 1), (0, 1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =14a(4) =45a(5) =154a(6) =551a(7) =2028a(8) =7665a(9) =29584a(10) =116265a(11) =463700a(12) =1873033a(13) =7648340a(14) =31530533a(15) =131079720a(16) =549015129a(17) =2314905316a(18) =9819648969a(19) =41881655112a(20) =179516554153a(21) =772952073692
External references
- oeis: A149892