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

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A028626 Expansion of (theta_3(z)*theta_3(15z) + theta_2(z)*theta_2(15z))^2. 3
 1, 4, 4, 0, 12, 24, 8, 16, 36, 4, 64, 16, 16, 24, 48, 20, 60, 40, 4, 48, 152, 16, 80, 48, 24, 124, 88, 0, 112, 56, 68, 64, 116, 32, 104, 176, 12, 56, 112, 32, 336, 104, 48, 96, 176, 24, 144, 112, 64, 100, 364, 32, 200, 88, 8, 256, 240, 32, 184, 112, 156, 120, 192 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Jinyuan Wang, Table of n, a(n) for n = 0..1000 PROG (PARI) a(n) = if( n<0, 0, polcoeff( (1 + 2 * x * Ser(qfrep( [ 2, 1; 1, 8], n, 1)))^2, n)); \\ Jinyuan Wang, Feb 19 2020 CROSSREFS Sequence in context: A021698 A199739 A121547 * A205507 A137862 A006805 Adjacent sequences:  A028623 A028624 A028625 * A028627 A028628 A028629 KEYWORD nonn AUTHOR EXTENSIONS More terms from Jinyuan Wang, Feb 19 2020 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.

Last modified December 4 17:03 EST 2021. Contains 349526 sequences. (Running on oeis4.)