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, 0), (0, -1, 1), (1, 0, 1), (1, 1, -1)}.
A148988
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, 0), (0, -1, 1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =33a(5) =114a(6) =439a(7) =1689a(8) =6816a(9) =27624a(10) =114988a(11) =482122a(12) =2052197a(13) =8800591a(14) =38111226a(15) =166113251a(16) =729043557a(17) =3217041687a(18) =14269984543a(19) =63581058548a(20) =284464187518
External references
- oeis: A148988