A013512 arctanh(sec(x)-sech(x))=2/2!*x^2+362/6!*x^6+1441682/10!*x^10...

2, 362, 1441682, 32555086202, 2447023018597922, 462534850269339720842, 184789477601927787169878962, 138612178386831070025588251376282, 179134512141830902349787461672276596802

Offset

0,1

Links

Table of n, a(n) for n=0..8.

Crossrefs

Sequence in context: A372992 A077350 A013506 * A295174 A320445 A142532

Adjacent sequences: A013509 A013510 A013511 * A013513 A013514 A013515

Keyword

nonn

Author

Patrick Demichel (patrick.demichel(AT)hp.com)

Extensions

More terms from Max Alekseyev, Feb 06 2010

Status

approved