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), (-1, 1, 0), (1, 0, -1), (1, 1, 1)}.
A149644
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), (-1, 1, 0), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =71a(5) =243a(6) =1179a(7) =4437a(8) =21789a(9) =86147a(10) =425685a(11) =1736631a(12) =8613497a(13) =35935349a(14) =178664741a(15) =757940191a(16) =3774358603a(17) =16219821809a(18) =80858307405a(19) =351072696975
External references
- oeis: A149644