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A166380 Diagonal sums of exponential Riordan array [1+x^2*sec(x),x], A166378. 1
1, 3, 19, 223, 4667, 160045, 8207125, 587420875, 55869454855, 6809387511403, 1034264079708019, 191477762192490649, 42435372869814513769, 11090351278621719882899, 3374951549996881393302715 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..14.

FORMULA

a(n)=sum{k=0..n, C(n+k,2k)*A166377(k)}.

CROSSREFS

Sequence in context: A277407 A271587 A217906 * A136652 A136504 A003111

Adjacent sequences:  A166377 A166378 A166379 * A166381 A166382 A166383

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Oct 13 2009

STATUS

approved

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Last modified October 22 18:55 EDT 2018. Contains 316500 sequences. (Running on oeis4.)