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

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