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, 1, 1), (0, 0, -1), (1, 0, 1)}.
A148708
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, 1, 1), (0, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =23a(5) =75a(6) =263a(7) =859a(8) =3055a(9) =10875a(10) =40543a(11) =149501a(12) =562541a(13) =2099899a(14) =8044899a(15) =30781625a(16) =119510149a(17) =462797441a(18) =1811981745a(19) =7089864721a(20) =28016037669a(21) =110639401373a(22) =440129015993
External references
- oeis: A148708