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, 1, 0), (0, 1, -1), (1, -1, 0), (1, 1, 1)}.
A149712
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, 1, 0), (0, 1, -1), (1, -1, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =71a(5) =285a(6) =1267a(7) =5415a(8) =24929a(9) =109791a(10) =514181a(11) =2325529a(12) =10975213a(13) =50591721a(14) =240309245a(15) =1121609839a(16) =5360709931a(17) =25239934277a(18) =121243984411a(19) =574860107777
External references
- oeis: A149712