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!)
A325295 E.g.f. A(x) satisfies: Sum_{n>=0} x^n * A(x)^(n*(n+1)/2) = Sum_{n>=0} x^n * exp(n^2*x). 1
1, 1, 3, 22, 293, 6396, 192247, 7487810, 359234409, 20571901624, 1375291211051, 105546986373918, 9179888213024509, 895591657896191348, 97191443720659321503, 11651115500493779746906, 1533793016323134419714513, 220607836736797491462201456, 34514721658321036998293295955, 5850764317548636197562977724758, 1070825456345525996396825473813221 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
LINKS
EXAMPLE
E.g.f.: A(x) = 1 + x + 3*x^2/2! + 22*x^3/3! + 293*x^4/4! + 6396*x^5/5! + 192247*x^6/6! + 7487810*x^7/7! + 359234409*x^8/8! + 20571901624*x^9/9! + 1375291211051*x^10/10! + ...
such that the following series are equal:
B(x) = 1 + x*A(x) + x^2*A(x)^3 + x^3*A(x)^6 + x^4*A(x)^10 + x^5*A(x)^15 + x^6*A(x)^21 + x^7*A(x)^28 + x^8*A(x)^36 + x^9*A(x)^45 + ...
B(x) = 1 + x*exp(x) + x^2*exp(4*x) + x^3*exp(9*x) + x^4*exp(16*x) + x^5*exp(25*x) + x^6*exp(36*x) + x^7*exp(49*x) + x^8*exp(64*x) + x^9*exp(81*x) + ...
where
B(x) = 1 + x + 4*x^2/2! + 33*x^3/3! + 436*x^4/4! + 8185*x^5/5! + 206046*x^6/6! + 6622945*x^7/7! + 263313688*x^8/8! + ... + A193421(n)*x^n/n! + ...
PROG
(PARI) {a(n) = my(A=[1]); for(i=1, n, A = concat(A, 0);
A[#A] = -polcoeff( sum(m=0, #A, x^m*( Ser(A)^(m*(m+1)/2) - exp(m^2*x +x*O(x^#A))) ), #A) ); n!*A[n+1]}
for(n=0, 30, print1(a(n), ", "))
CROSSREFS
Cf. A193421.
Sequence in context: A108991 A247659 A244468 * A298693 A326430 A119390
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Apr 26 2019
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 July 18 00:08 EDT 2024. Contains 374377 sequences. (Running on oeis4.)