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, 0), (-1, 0, 0), (1, 0, 1), (1, 1, -1)}.
A148788
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, 0), (-1, 0, 0), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =25a(5) =72a(6) =247a(7) =801a(8) =2790a(9) =9275a(10) =33417a(11) =116063a(12) =421415a(13) =1481888a(14) =5475112a(15) =19691593a(16) =73098992a(17) =264873884a(18) =993746300a(19) =3650365583a(20) =13739262338a(21) =50721769977a(22) =192273730672a(23) =716347593301
External references
- oeis: A148788