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), (0, 0, -1), (1, 0, 1), (1, 1, -1)}.
A149408
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), (0, 0, -1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =52a(5) =192a(6) =870a(7) =3582a(8) =16589a(9) =71955a(10) =338268a(11) =1514672a(12) =7199780a(13) =32946510a(14) =157849905a(15) =733478937a(16) =3534723692a(17) =16611444982a(18) =80413000420a(19) =381184590682
External references
- oeis: A149408