The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A193549 E.g.f.: Sum_{n>=0} (1/n!) * Product_{k=1..n} tan(k*x). 1
 1, 1, 2, 8, 64, 696, 9872, 191008, 4566784, 131276032, 4579799552, 186766023168, 8790216177664, 476464164850688, 29213015354673152, 2012710664900415488, 155075844379301576704, 13231714749051132248064, 1244975006293271728750592 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Vaclav Kotesovec, Table of n, a(n) for n = 0..150 EXAMPLE A(x) = 1 + x + 2*x^2/2! + 8*x^3/3! + 64*x^4/4! + 696*x^5/5! + 9872*x^6/6! +... where A(x) = 1 + tan(x) + tan(x)*tan(2*x)/2!  + tan(x)*tan(2*x)*tan(3*x)/3! +... PROG (PARI) {a(n)=local(X=x+x*O(x^n), Egf); Egf=sum(m=0, n, prod(k=1, m, tan(k*X))/m!); n!*polcoeff(Egf, n)} CROSSREFS Sequence in context: A052707 A059862 A268666 * A005612 A326290 A136282 Adjacent sequences:  A193546 A193547 A193548 * A193550 A193551 A193552 KEYWORD nonn AUTHOR Paul D. Hanna, Jul 30 2011 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified August 2 08:13 EDT 2021. Contains 346422 sequences. (Running on oeis4.)