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A141479 A000111(n) + A014695(n). 2
2, 3, 3, 3, 6, 18, 63, 273, 1386, 7938, 50523, 353793, 2702766, 22368258, 199360983, 1903757313, 19391512146, 209865342978, 2404879675443, 29088885112833, 370371188237526, 4951498053124098, 69348874393137903, 1015423886506852353 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

a(n) is a multiple of 3 for n > 0.

LINKS

Table of n, a(n) for n=0..23.

MAPLE

A000111 := proc(n) local x; n!*coeftayl( sec(x)+tan(x), x=0, n) ; end: A014695 := proc(n) local x; coeftayl( (1+2*x+2*x^2+x^3)/(1-x^4), x=0, n) ; end: A141479 := proc(n) A000111(n)+A014695(n) ; end: for n from 0 to 30 do printf("%a, ", A141479(n)) ; od; # R. J. Mathar, Sep 12 2008

CROSSREFS

Sequence in context: A070167 A168113 A170895 * A055081 A275379 A109833

Adjacent sequences:  A141476 A141477 A141478 * A141480 A141481 A141482

KEYWORD

nonn,easy

AUTHOR

Paul Curtz, Aug 09 2008

EXTENSIONS

Extended by R. J. Mathar, Sep 12 2008

STATUS

approved

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Last modified May 14 16:48 EDT 2021. Contains 343898 sequences. (Running on oeis4.)