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, 0, 0), (-1, 0, 1), (1, -1, 0), (1, 1, -1), (1, 1, 1)}.
A149798
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, 0, 0), (-1, 0, 1), (1, -1, 0), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =19a(4) =87a(5) =361a(6) =1725a(7) =7687a(8) =37101a(9) =170795a(10) =834677a(11) =3932441a(12) =19303463a(13) =92161037a(14) =454658169a(15) =2193047187a(16) =10845000033a(17) =52668165919a(18) =261103799245
External references
- oeis: A149798