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A012848 tanh(sec(x)*arctanh(x))=x+3/3!*x^3-15/5!*x^5-1869/7!*x^7-88959/9!*x^9... 0
1, 3, -15, -1869, -88959, 202499, 974640433, 190241481587, 15481756625281, -5564353308576125, -3510791865515349775, -961065703006847944525, 92025876595389114977025, 299254465799630697304777347 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
CROSSREFS
Sequence in context: A231656 A096368 A016066 * A322714 A202621 A076046
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved

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Last modified July 14 19:09 EDT 2024. Contains 374323 sequences. (Running on oeis4.)