login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A154226 List of pairs: {((n*(n+1)/2)^2, (n!)^3}. 1

%I

%S 0,1,1,1,9,8,36,216,100,13824,225,1728000,441,373248000,784,

%T 128024064000,1296,65548320768000,2025,47784725839872000,3025,

%U 47784725839872000000,4356,63601470092869632000000,6084

%N List of pairs: {((n*(n+1)/2)^2, (n!)^3}.

%H G. C. Greubel, <a href="/A154226/b154226.txt">Table of n, a(n) for n = 0..500</a>

%F a(2n+1)=A000442(n) = (n!)^3.

%F a(2n) = A000537(n) = (n*(n+1)/2)^2.

%t Clear[a, n, n];

%t a[0] = 0; a[n_] := a[n] = n^3 + a[n - 1];

%t b[0] = 1; b[n_] := b[n] = n^3*b[n - 1];

%t Table[{a[n] - (n*(n + 1)/2)^2, b[n] - (n!)^3}, {n, 0, 10}]; (* verification *)

%t Flatten[Table[{a[n], b[n]}, {n, 0, 15}]] (* sequence values *)

%o (MAGMA) &cat[[(n*(n+1)/2)^2, Factorial(n)^3]: n in [0..15]]; // _Vincenzo Librandi_, Sep 07 2016

%K nonn,easy

%O 0,5

%A _Roger L. Bagula_, Jan 05 2009

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 September 28 07:55 EDT 2020. Contains 337394 sequences. (Running on oeis4.)