Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of n steps taken from {(-1, -1), (-1, 0), (0, -1), (0, 1), (1, 1)}.
A151427
Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of n steps taken from {(-1, -1), (-1, 0), (0, -1), (0, 1), (1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =11a(4) =42a(5) =151a(6) =595a(7) =2362a(8) =9659a(9) =40156a(10) =169190a(11) =722425a(12) =3111656a(13) =13529583a(14) =59224749a(15) =261002367a(16) =1156483097a(17) =5150230075a(18) =23036615255a(19) =103451200949a(20) =466235529649
External references
- oeis: A151427