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), (1, 0), (1, 1)}.
A151316
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), (1, 0), (1, 1)}.
Terms
- a(0) =1a(1) =3a(2) =12a(3) =51a(4) =225a(5) =1020a(6) =4691a(7) =21859a(8) =102708a(9) =486132a(10) =2313507a(11) =11061139a(12) =53085223a(13) =255590813a(14) =1233990233a(15) =5971857421a(16) =28960718794a(17) =140702481744a(18) =684696284001
External references
- oeis: A151316