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, -1), (1, 1)}.
A151274
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, -1), (1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =13a(4) =51a(5) =179a(6) =685a(7) =2609a(8) =10269a(9) =40435a(10) =162355a(11) =654197a(12) =2663021a(13) =10896113a(14) =44862303a(15) =185524733a(16) =770809891a(17) =3213995231a(18) =13449327811a(19) =56449627333a(20) =237606240991
External references
- oeis: A151274