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, 0), (0, 1, 0), (1, -1, 0), (1, 1, -1)}.
A148135
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, 0), (0, 1, 0), (1, -1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =11a(5) =28a(6) =83a(7) =254a(8) =827a(9) =2724a(10) =9487a(11) =33462a(12) =121479a(13) =449168a(14) =1692977a(15) =6472741a(16) =25141274a(17) =98782902a(18) =392894212a(19) =1578743442a(20) =6404897025a(21) =26212710057a(22) =108149946290a(23) =449505848867
External references
- oeis: A148135