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, 0), (0, -1, 0), (0, 0, -1), (1, 1, 1)}.
A149590
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, 0), (0, -1, 0), (0, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =57a(5) =217a(6) =863a(7) =3437a(8) =14245a(9) =58719a(10) =248277a(11) =1047681a(12) =4500453a(13) =19296867a(14) =83883423a(15) =364076061a(16) =1597411029a(17) =6999282601a(18) =30941709011a(19) =136616489201a(20) =607700266033
External references
- oeis: A149590