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, 1), (-1, 1, 0), (0, 1, 1), (1, 0, 0)}.
A150123
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, 1), (-1, 1, 0), (0, 1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =68a(5) =250a(6) =934a(7) =3566a(8) =13912a(9) =54916a(10) =219020a(11) =883022a(12) =3585810a(13) =14649798a(14) =60248906a(15) =248939966a(16) =1032848900a(17) =4304004792a(18) =17994933548a(19) =75461738696a(20) =317428584708
External references
- oeis: A150123