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A243413 Number of Dyck paths of semilength n having exactly 1 occurrence of the consecutive steps UDUUDU (with U=(1,1), D=(1,-1)). 2
1, 5, 19, 70, 259, 962, 3585, 13399, 50201, 188481, 709001, 2671624, 10082895, 38107919, 144214978, 546413880, 2072553851, 7869081412, 29904874545, 113744129791, 432969825404, 1649313815911, 6287005845873, 23980562901849, 91523321091182, 349497990760012 (list; graph; refs; listen; history; text; internal format)
OFFSET
4,2
LINKS
Vaclav Kotesovec, Recurrence (of order 10)
FORMULA
a(n) ~ c * d^n / sqrt(n), where d = 3.8821590268628506747194368909643384... (same as for A243412) is the root of the equation d^8 - 2*d^7 - 10*d^6 + 12*d^5 - 5*d^4 - 2*d^3 - 5*d^2 - 8*d - 3 = 0, and c = 0.0159763870992602878106411532836296... . - Vaclav Kotesovec, Jun 05 2014
CROSSREFS
Column k=1 of A243366.
Sequence in context: A030662 A149758 A026590 * A222538 A095073 A128349
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Jun 04 2014
STATUS
approved

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Last modified June 18 10:39 EDT 2024. Contains 373479 sequences. (Running on oeis4.)