Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0) and consisting of n steps taken from {(-1, 0), (0, -1), (0, 1), (1, 0), (1, 1)}.
A151319
Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0) and consisting of n steps taken from {(-1, 0), (0, -1), (0, 1), (1, 0), (1, 1)}.
Terms
- a(0) =1a(1) =3a(2) =13a(3) =57a(4) =263a(5) =1233a(6) =5869a(7) =28201a(8) =136471a(9) =664031a(10) =3244373a(11) =15904999a(12) =78180131a(13) =385141745a(14) =1900808447a(15) =9395586359a(16) =46502309921a(17) =230413447773
External references
- oeis: A151319