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, 0), (0, -1), (0, 1), (1, 1)}.
A151299
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, 0), (0, -1), (0, 1), (1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =28a(4) =116a(5) =465a(6) =1980a(7) =8393a(8) =36495a(9) =159224a(10) =703466a(11) =3122910a(12) =13965291a(13) =62727001a(14) =283127006a(15) =1282634921a(16) =5831588809a(17) =26593352814a(18) =121612750646a(19) =557511728992
External references
- oeis: A151299