Area under all paths in the first quadrant from (0,0) to (n,0) using steps U=(1,1), D=(1,-1), h=(1,0) and H=(2,0).

A134424

Area under all paths in the first quadrant from (0,0) to (n,0) using steps U=(1,1), D=(1,-1), h=(1,0) and H=(2,0).

Terms

    a(0) =0a(1) =0a(2) =1a(3) =4a(4) =21a(5) =80a(6) =316a(7) =1152a(8) =4186a(9) =14812a(10) =52020a(11) =180616a(12) =623338a(13) =2138040a(14) =7302035a(15) =24842736a(16) =84262609a(17) =285052676a(18) =962184359a(19) =3241616628a(20) =10903119167a(21) =36619715860a(22) =122837641530a(23) =411588875136

External references