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A012950 a(n) = (2n+1)! * [x^(2n+1)]; expansion of arcsin(tan(x)+arcsin(x)). 0
2, 11, 433, 47777, 10445209, 3792307917, 2060929368925, 1565891035323617, 1584908855099457809, 2061186455316106953685, 3349214731529157234143461, 6649249948563897129719525769, 15836980365691934720682871441241, 44569352711436570809863777097634621 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,1
LINKS
MAPLE
a:= n-> (2*n+1)! *coeff(series(arcsin(tan(x)+arcsin(x)), x, 2*n+2), x, 2*n+1): seq(a(n), n=0..20);
MATHEMATICA
Partition[CoefficientList[Series[ArcSin[Tan[x] + ArcSin[x]], {x, 0, 23}], x]*Range[0, 23]!, 2][[All, 2]]
PROG
(PARI) x='x+O('x^33); /* that many terms */
v=Vec(serlaplace(asin(tan(x)+asin(x)))); /* every second term is zero */
vector(#v\2, n, v[2*n-1]) /* show terms */
/* Joerg Arndt, Mar 16 2011 */
CROSSREFS
Sequence in context: A052290 A145512 A013046 * A012979 A013109 A120934
KEYWORD
nonn
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved

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Last modified March 29 02:23 EDT 2024. Contains 371264 sequences. (Running on oeis4.)