A024290 - OEIS

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A024290

Expansion of tan(tan(x)^2)/2.

0, 1, 8, 256, 17408, 1910656, 309060608, 69341479936, 20585851486208, 7805361597546496, 3678560956503031808, 2108887897093614862336, 1444987869648059585527808, 1166088560957891800314413056

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OFFSET

0,3

LINKS

Table of n, a(n) for n=0..13.

MATHEMATICA

Tan[ Tan[ x ]^2 ]/2 (* Even Part *)

CROSSREFS

A009710.

Sequence in context: A013824 A010044 A374283 * A253165 A140338 A140339

Adjacent sequences: A024287 A024288 A024289 * A024291 A024292 A024293

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved