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A246251 Number of permutations of [n] with exactly six occurrences of the consecutive step pattern up, down, down. 2
1488257158851, 176902009674966, 13166075391964578, 775944032960346939, 39844140679287441918, 1872063201155821139178, 82897279832156950225548, 3526803545750650310760216, 146090377422354615989531688, 5948505245302032452585146020, 239776137775416266444362226760 (list; graph; refs; listen; history; text; internal format)
OFFSET

19,1

LINKS

Alois P. Heinz, Table of n, a(n) for n = 19..160

FORMULA

a(n) ~  c * (3*sqrt(3)/(2*Pi))^n * n! * n^6, where c = 0.000003054026651631929902... = c0 * (c0-1)^6 / (3^6 * 6!), and c0 = (1 + exp(Pi/sqrt(3))) * sqrt(3) / (2*Pi). - Vaclav Kotesovec, Aug 26 2014

CROSSREFS

Column k=6 of A242819.

Sequence in context: A213601 A213646 A288276 * A320943 A248892 A172799

Adjacent sequences:  A246248 A246249 A246250 * A246252 A246253 A246254

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Aug 20 2014

STATUS

approved

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Last modified March 5 15:22 EST 2021. Contains 341825 sequences. (Running on oeis4.)