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, 1, 0), (0, 1, 0), (0, 1, 1), (1, 0, -1)}.
A149950
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, 1, 0), (0, 1, 0), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =50a(5) =175a(6) =643a(7) =2442a(8) =9497a(9) =37772a(10) =152799a(11) =626592a(12) =2602438a(13) =10922440a(14) =46249757a(15) =197449903a(16) =848960606a(17) =3672993876a(18) =15982347311a(19) =69901749199a(20) =307137650010
External references
- oeis: A149950