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

 

Logo

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A083707 G.f.: (x+4*x^3+x^5)/((1-x)^2*(1-x^2)^2*(1-x^3)). 3

%I

%S 0,1,2,9,17,37,63,108,165,252,358,506,684,917,1192,1539,1941,2433,

%T 2997,3670,4433,5328,6332,7492,8784,10257,11886,13725,15745,18005,

%U 20475,23216,26197,29484,33042,36942,41148,45733,50660,56007,61733,67921,74529,81642

%N G.f.: (x+4*x^3+x^5)/((1-x)^2*(1-x^2)^2*(1-x^3)).

%D H. Gupta, Magic partitions, I, Math. Student 45 (1977), no. 3, 58-62.

%H <a href="/index/Rec#order_09">Index entries for linear recurrences with constant coefficients</a>, signature (2, 1, -3, -1, 1, 3, -1, -2, 1).

%F a(0)=0, a(1)=1, a(2)=2, a(3)=9, a(4)=17, a(5)=37, a(6)=63, a(7)=108, a(8)=165, a(n)=2*a(n-1)+a(n-2)-3*a(n-3)-a(n-4)+a(n-5)+3*a(n-6)- a(n-7)-2*a(n-8)+ a(n-9). - _Harvey P. Dale_, May 01 2015

%t CoefficientList[Series[(x+4x^3+x^5)/((1-x)^2(1-x^2)^2(1-x^3)),{x,0,50}],x] (* or *) LinearRecurrence[{2,1,-3,-1,1,3,-1,-2,1},{0,1,2,9,17,37,63,108,165},50] (* _Harvey P. Dale_, May 01 2015 *)

%Y Cf. A083708, A083709.

%K nonn

%O 0,3

%A _N. J. A. Sloane_, Jun 15 2003

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 January 22 04:27 EST 2020. Contains 331133 sequences. (Running on oeis4.)