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), (-1, 0, 1), (1, -1, -1), (1, 1, 0)}.
A148657
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), (-1, 0, 1), (1, -1, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =25a(5) =65a(6) =254a(7) =789a(8) =3276a(9) =10614a(10) =44813a(11) =155906a(12) =661434a(13) =2362970a(14) =10220577a(15) =37614941a(16) =162469168a(17) =612478229a(18) =2669883881a(19) =10204917780a(20) =44610693636a(21) =173498753593a(22) =760158224730
External references
- oeis: A148657