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), (0, 1, 0), (1, -1, -1), (1, -1, 1)}.
A148249
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), (0, 1, 0), (1, -1, -1), (1, -1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =13a(5) =36a(6) =120a(7) =405a(8) =1421a(9) =4942a(10) =18005a(11) =66224a(12) =244983a(13) =920546a(14) =3511295a(15) =13437212a(16) =51845126a(17) =202180183a(18) =792038001a(19) =3115664151a(20) =12346400803a(21) =49158528575a(22) =196269393640a(23) =787327344358
External references
- oeis: A148249