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), (1, 0, -1), (1, 1, -1), (1, 1, 0)}.
A148715
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), (1, 0, -1), (1, 1, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =24a(5) =70a(6) =264a(7) =871a(8) =3427a(9) =12155a(10) =49471a(11) =184280a(12) =766809a(13) =2960544a(14) =12533294a(15) =49710976a(16) =213269188a(17) =864022759a(18) =3746852106a(19) =15440886655a(20) =67553784034a(21) =282328209955
External references
- oeis: A148715