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

 

Logo

Invitation: celebrating 50 years of OEIS, 250000 sequences, and Sloane's 75th, there will be a conference at DIMACS, Rutgers, Oct 9-10 2014.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A203478 v(n+1)/v(n), where v=A203477. 2
3, 30, 1080, 146880, 77552640, 161309491200, 1331771159347200, 43809944057885491200, 5753472333233985788313600, 3019422280481195741706977280000, 6335279362770913356551778761441280000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..11.

MATHEMATICA

f[j_] := 2^(j - 1); z = 13;

v[n_] := Product[Product[f[k] + f[j],

{j, 1, k - 1}], {k, 2, n}]

Table[v[n], {n, 1, z}]              (* A203477 *)

Table[v[n + 1]/v[n], {n, 1, z - 1}] (* A203478 *)

Table[v[n] v[n + 2]/(2*v[n + 1]^2),

{n, 1, 22}] (* A164051 *)

CROSSREFS

Cf. A203477, A203307, A093883.

Sequence in context: A184575 A229373 A203469 * A012008 A203415 A203520

Adjacent sequences:  A203475 A203476 A203477 * A203479 A203480 A203481

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jan 02 2012

STATUS

approved

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

Content is available under The OEIS End-User License Agreement .

Last modified July 30 10:03 EDT 2014. Contains 245063 sequences.