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, 1), (0, 0, 1), (1, -1, 0), (1, 1, -1)}.
A148407
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, 1), (0, 0, 1), (1, -1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =17a(5) =52a(6) =178a(7) =650a(8) =2429a(9) =9195a(10) =35763a(11) =143627a(12) =575774a(13) =2347671a(14) =9720885a(15) =40634851a(16) =170480202a(17) =723016389a(18) =3094415599a(19) =13279927487a(20) =57328187446a(21) =249153610779
External references
- oeis: A148407