Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0) and consisting of n steps taken from {(-1, -1), (-1, 1), (-1, 0), (1, 0), (1, 1)}.
A151306
Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0) and consisting of n steps taken from {(-1, -1), (-1, 1), (-1, 0), (1, 0), (1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =9a(3) =29a(4) =139a(5) =511a(6) =2498a(7) =9781a(8) =48238a(9) =196055a(10) =971491a(11) =4047652a(12) =20113296a(13) =85304735a(14) =424646194a(15) =1825369912a(16) =9097470592a(17) =39520352083a(18) =197127302029a(19) =863661309954
External references
- oeis: A151306