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A012838 sec(sec(x)*tanh(x))=1+1/2!*x^2+9/4!*x^4+297/6!*x^6+14385/8!*x^8... 0
1, 1, 9, 297, 14385, 1207729, 143876601, 23841581337, 5193194291937, 1442318342390497, 497436148816555113, 208516037618871269001, 104439610892072605613073, 61591265237655555392072593 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
LINKS
CROSSREFS
Sequence in context: A129934 A003303 A371252 * A216966 A211077 A211082
KEYWORD
nonn
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved

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Last modified July 21 09:16 EDT 2024. Contains 374472 sequences. (Running on oeis4.)