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, 1), (-1, 1, 1), (0, 0, -1), (1, 1, 1)}.
A149589
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, 1), (-1, 1, 1), (0, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =57a(5) =205a(6) =809a(7) =3119a(8) =12409a(9) =49395a(10) =200319a(11) =813021a(12) =3331245a(13) =13694535a(14) =56693979a(15) =235293123a(16) =981003705a(17) =4101098479a(18) =17208126251a(19) =72362389463a(20) =305135947291
External references
- oeis: A149589