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!)
A112121 G.f. A(x) satisfies A(A(A(..(A(x))..))) = B(x) (10th self-COMPOSE of A) such that the coefficients of B(x) consist only of numbers {1,2,3,..,10}, with B(0) = 0. 3

%I #6 Mar 14 2015 01:08:43

%S 1,1,-8,104,-1619,27437,-482626,8553639,-149434331,2527339944,

%T -40748011084,619534898788,-8892967520397,124088656925363,

%U -1797865061490547,28140512084643142,-424643873334235802,4269156014010214570,19251023484926369328,-1456780704021544219838

%N G.f. A(x) satisfies A(A(A(..(A(x))..))) = B(x) (10th self-COMPOSE of A) such that the coefficients of B(x) consist only of numbers {1,2,3,..,10}, with B(0) = 0.

%e A(x) = x + x^2 - 8*x^3 + 104*x^4 - 1619*x^5 + 27437*x^6 +...

%e where A(A(A(A(A(A(A(A(A(A(x)))))))))) =

%e x + 10*x^2 + 10*x^3 + 5*x^4 + 10*x^5 + 5*x^6 + 8*x^7 +...

%e is the g.f. of A112120.

%o (PARI) {a(n,m=10)=local(F=x+x^2+x*O(x^n),G);if(n<1,0, for(k=3,n, G=F+x*O(x^k);for(i=1,m-1,G=subst(F,x,G)); F=F-((polcoeff(G,k)-1)\m)*x^k); return(polcoeff(F,n,x)))}

%Y Cf. A112120, A112104-A112119, A112122-A112127.

%K sign

%O 1,3

%A _Paul D. Hanna_, Aug 27 2005

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 June 29 19:38 EDT 2024. Contains 373855 sequences. (Running on oeis4.)