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, 0), (-1, 0, -1), (-1, 1, 1), (1, -1, 1), (1, 1, 0)}.
A149222
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, 0), (-1, 0, -1), (-1, 1, 1), (1, -1, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =44a(5) =142a(6) =648a(7) =2346a(8) =10929a(9) =41996a(10) =198400a(11) =790809a(12) =3772937a(13) =15423184a(14) =74122058a(15) =308698810a(16) =1491917931a(17) =6303461720a(18) =30598038823a(19) =130770863783a(20) =636981609747
External references
- oeis: A149222