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 A291888 Number of symmetrically unique Dyck paths of semilength n and height four. 2
 1, 4, 19, 69, 252, 855, 2867, 9339, 30085, 95524, 300796, 939228, 2915481, 9001380, 27675779, 84782673, 258956584, 788926699, 2398385803, 7277878707, 22050326805, 66718218120, 201640080056, 608808949752, 1836608777233, 5536482441124, 16679237438035 (list; graph; refs; listen; history; text; internal format)
 OFFSET 4,2 LINKS Alois P. Heinz, Table of n, a(n) for n = 4..1000 Index entries for linear recurrences with constant coefficients, signature (8, -19, -2, 66, -76, 3, 30, -9). FORMULA G.f.: x^4*(3*x^4-5*x^3+6*x^2-4*x+1)/((x-1)*(3*x-1)*(x^2-3*x+1)*(3*x^2-1)*(x^2+x-1)). CROSSREFS Column k=4 of A291883. Sequence in context: A000306 A100185 A357251 * A217324 A129019 A167247 Adjacent sequences: A291885 A291886 A291887 * A291889 A291890 A291891 KEYWORD nonn,easy AUTHOR Alois P. Heinz, Sep 05 2017 STATUS approved

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Last modified February 28 20:40 EST 2024. Contains 370400 sequences. (Running on oeis4.)