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, 1), (1, 0, -1), (1, 0, 0), (1, 1, -1)}.
A148425
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, 1), (1, 0, -1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =18a(5) =59a(6) =240a(7) =868a(8) =3712a(9) =14542a(10) =64196a(11) =264949a(12) =1197681a(13) =5121331a(14) =23540836a(15) =103253933a(16) =480622773a(17) =2149426077a(18) =10102076321a(19) =45872426353a(20) =217233749441a(21) =998548779839
External references
- oeis: A148425