A024339 - OEIS

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A024339

Expansion of tan(log(1+x))*log(1+x)/2.

0, 0, 1, -3, 15, -90, 662, -5712, 56688, -635616, 7944640, -109494880, 1649256800, -26948575680, 474694809920, -8965921171200, 180743109203200, -3873060672256000, 87906536803046400, -2106613788720768000

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,4

LINKS

Table of n, a(n) for n=0..19.

MATHEMATICA

Tan[ Log[ 1+x ] ]*Log[ 1+x ]/2

CROSSREFS

Cf. A009645.

Sequence in context: A201953 A355501 A185369 * A319950 A336743 A374657

Adjacent sequences: A024336 A024337 A024338 * A024340 A024341 A024342

KEYWORD

sign

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs, Mar 1997

STATUS

approved