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), (0, -1, 1), (1, 1, -1), (1, 1, 1)}.
A149622
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), (0, -1, 1), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =65a(5) =249a(6) =1071a(7) =4559a(8) =20009a(9) =88587a(10) =397369a(11) =1796375a(12) =8202769a(13) =37639895a(14) =173955497a(15) =807209165a(16) =3764198105a(17) =17620920645a(18) =82776073951a(19) =390099799289
External references
- oeis: A149622