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, -1, 1), (-1, 1, -1), (1, -1, 0), (1, 1, 0)}.
A149086
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, -1, 1), (-1, 1, -1), (1, -1, 0), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =7a(4) =30a(5) =69a(6) =305a(7) =821a(8) =3706a(9) =10951a(10) =50167a(11) =157879a(12) =731126a(13) =2409735a(14) =11251900a(15) =38416059a(16) =180553280a(17) =633903339a(18) =2995076713a(19) =10757081251a(20) =51047312394a(21) =186835993771a(22) =889875336356
External references
- oeis: A149086