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A024252 Expansion of tan(x)*tan(tanh(x))/2. 0
0, 1, 4, 24, 1088, 36352, 1283584, 160269312, 11824283648, 1434982481920, 275376204414976, 40808962274623488, 10384927347565395968, 2724691062936548933632, 799682075020079191293952 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

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

MATHEMATICA

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

CROSSREFS

A009751.

Sequence in context: A009043 A024251 A193484 * A303131 A012124 A108185

Adjacent sequences:  A024249 A024250 A024251 * A024253 A024254 A024255

KEYWORD

nonn

AUTHOR

R. H. Hardin

EXTENSIONS

Extended and signs tested 03/97.

STATUS

approved

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Last modified July 6 12:26 EDT 2022. Contains 355110 sequences. (Running on oeis4.)