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, 1, 0), (1, 0, 1)}.
A149847
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, 1, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =14a(4) =46a(5) =134a(6) =502a(7) =1820a(8) =5980a(9) =23198a(10) =87922a(11) =306836a(12) =1216060a(13) =4729934a(14) =17121082a(15) =68851202a(16) =272448226a(17) =1010816594a(18) =4108318162a(19) =16458898196a(20) =62164300252a(21) =254714419202
External references
- oeis: A149847