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), (0, 0, 1), (0, 1, 1), (1, 1, 0)}.
A151033
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), (0, 0, 1), (0, 1, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =3a(2) =9a(3) =31a(4) =111a(5) =397a(6) =1465a(7) =5479a(8) =20495a(9) =77641a(10) =296045a(11) =1129451a(12) =4337187a(13) =16717677a(14) =64478697a(15) =249647575a(16) =968902903a(17) =3762652881a(18) =14648257893a(19) =57120858211a(20) =222864458027a(21) =871020059445
External references
- oeis: A151033