login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A184507 G.f. satisfies: A(x) = B(x/A(x)), where B(x) is the g.f. of A184506. 2
1, 1, -1, 4, -16, 86, -482, 3074, -20478, 147227, -1101843, 8702605, -71285202, 609348589, -5385150192, 49346937185, -466332024088, 4550830295128, -45705121373663, 472675376094619, -5022099348895724, 54826872973024796, -613998703071634703, 7052884860025205276 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,4
COMMENTS
The g.f. B(x) of A184506 satisfies B(x) = 1 + x*G(x)/A(x) where G(x) = B(x*G(x)) = A(x*G(x)^2) is the g.f. of A184508 and A(x) = B(x/A(x)) = G(x/A(x)^2) is the g.f. of this sequence.
LINKS
EXAMPLE
G.f.: A(x) = 1 + x - x^2 + 4*x^3 - 16*x^4 + 86*x^5 - 482*x^6 + 3074*x^7 +...
Related expansions.
A(x) = B(x/A(x)) where B(x) = A(x*B(x)) is the g.f. of A184506:
B(x) = 1 + x + 2*x^3 - 3*x^4 + 27*x^5 - 91*x^6 + 723*x^7 -+...
Also, A(x) = G(x/A(x)^2) where G(x) = A(x*G(x)^2) is the g.f. of A184508:
G(x) = 1 + x + x^2 + 3*x^3 + 6*x^4 + 33*x^5 + 79*x^6 + 661*x^7 +...
PROG
(PARI) {a(n)=local(A=1, F=1+x+x*O(x^n)); for(i=1, n, A=x/serreverse(x*F); F=1+serreverse(x/F)/A + x*O(x^n)); polcoeff(A, n)}
for(n=0, 30, print1(a(n), ", "))
CROSSREFS
Sequence in context: A006681 A074876 A238722 * A165964 A300279 A321238
KEYWORD
sign
AUTHOR
Paul D. Hanna, Dec 22 2012
STATUS
approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 13 05:03 EDT 2024. Contains 371639 sequences. (Running on oeis4.)