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, 1, 1), (1, 0, -1), (1, 0, 0)}.
A148644
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, 1, 1), (1, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =23a(5) =61a(6) =253a(7) =756a(8) =3261a(9) =10535a(10) =46682a(11) =159070a(12) =717567a(13) =2541790a(14) =11617044a(15) =42393793a(16) =195701362a(17) =731199645a(18) =3401970662a(19) =12956824923a(20) =60665684810a(21) =234762379562
External references
- oeis: A148644