login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A136393 a(n) = C(3^n,n). 11
1, 3, 36, 2925, 1663740, 6774333588, 204208594169580, 47025847059877940202, 84798009611754271531960140, 1219731290030242386267605060168700, 141916030352038369973126553950792759280336 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..45

FORMULA

G.f.: A(x) = Sum_{n>=0} log(1 + 3^n*x)^n / n!.

a(n) ~ 3^(n^2)/n!. - Vaclav Kotesovec, Jul 02 2016

MATHEMATICA

Table[Binomial[3^n, n], {n, 0, 10}] (* Vaclav Kotesovec, Jul 02 2016 *)

PROG

(PARI) a(n)=binomial(3^n, n)

(PARI) /* G.f. A(x) as Sum of Series: */

a(n)=polcoeff(sum(k=0, n, log(1+3^k*x +x*O(x^n))^k/k!), n)

(MAGMA) [Binomial(3^n, n): n in [0..25]]; // Vincenzo Librandi, Sep 13 2016

CROSSREFS

Cf. A014070 (C(2^n, n)).

Sequence in context: A193302 A289315 A102579 * A168370 A158093 A163966

Adjacent sequences:  A136390 A136391 A136392 * A136394 A136395 A136396

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Dec 28 2007

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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 16 12:38 EDT 2019. Contains 324152 sequences. (Running on oeis4.)