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, 0, -1), (1, 0, 1)}.
A148692
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, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =23a(5) =66a(6) =227a(7) =713a(8) =2577a(9) =8568a(10) =31421a(11) =107380a(12) =402624a(13) =1417736a(14) =5348491a(15) =19083805a(16) =72852019a(17) =264474288a(18) =1012997899a(19) =3707123478a(20) =14304055198a(21) =52928721410a(22) =204637258329a(23) =761248539668
External references
- oeis: A148692