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A291891 Number of symmetrically unique Dyck paths of semilength n and height seven. 2
1, 7, 55, 319, 1705, 8238, 37674, 164229, 692627, 2843282, 11433826, 45212792, 176385132, 680452948, 2600725892, 9862321095, 37150333241, 139139984973, 518538211261, 1924077739700, 7112221384554, 26201080984497, 96233327019085, 352501632479306 (list; graph; refs; listen; history; text; internal format)
OFFSET

7,2

LINKS

Alois P. Heinz, Table of n, a(n) for n = 7..1000

Index entries for linear recurrences with constant coefficients, signature (13, -60, 84, 203, -807, 569, 1173, -2090, 480, 1046, -662, -16, 76, -8).

FORMULA

G.f.: -x^7*(6*x-24*x^2+60*x^3-67*x^4+21*x^5+x^6+x^7-1) / ((x-1) *(2*x-1) *(2*x^2-4*x+1) *(x^3+3*x^2-1) *(x^3-9*x^2+6*x-1) *(2*x^4-4*x^2+1)).

CROSSREFS

Column k=7 of A291883.

Sequence in context: A062212 A272864 A121183 * A217327 A069404 A198689

Adjacent sequences:  A291888 A291889 A291890 * A291892 A291893 A291894

KEYWORD

nonn,easy

AUTHOR

Alois P. Heinz, Sep 05 2017

STATUS

approved

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Last modified October 19 22:55 EDT 2019. Contains 328244 sequences. (Running on oeis4.)