a(n) is the number of exterior top arches (no covering arch) for semi-meanders in generation n+1 that are generated by semi-meanders with n top arches and floor(n/2) exterior top arches using the exterior arch splitting algorithm.

A366415

a(n) is the number of exterior top arches (no covering arch) for semi-meanders in generation n+1 that are generated by semi-meanders with n top arches and floor(n/2) exterior top arches using the exterior arch splitting algorithm.

Terms

    a(0) =10a(1) =34a(2) =78a(3) =222a(4) =362a(5) =938a(6) =1326a(7) =3246a(8) =4242a(9) =10002a(10) =12438a(11) =28566a(12) =34330a(13) =77338a(14) =90654a(15) =201246a(16) =231458a(17) =507938a(18) =575526a(19) =1251366a(20) =1400874a(21) =3022890a(22) =3350574a(23) =7184430a(24) =7897138a(25) =16842802a(26) =18382902a(27) =39026742a(28) =42336314a(29) =89522234

External references