The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A302661 Real part of Product_{k=1..n} (k+(n-k+1)i), with i=sqrt(-1). 3
 1, 1, 0, -20, -221, -1560, 0, 272000, 6356025, 84086080, 0, -40560998400, -1449723503125, -28152429760000, 0, 26582971351040000, 1279483892211136625, 32774236110420480000, 0, -51128938217766256640000, -3094745459011904478178125, -98456230888859903488000000, 0, 229377281607595274010624000000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 COMMENTS a(n) = 0 for n mod 4 = 2 (A016825). - Michel Marcus, Apr 11 2018 LINKS Seiichi Manyama, Table of n, a(n) for n = 0..398 MAPLE seq(Re(mul(k+(n-k+1)*I, k=1..n)), n=0..30); # Muniru A Asiru, Apr 11 2018 PROG (PARI) {a(n) = real(prod(k=1, n, k+(n-k+1)*I))} CROSSREFS Cf. A016825, A301616. Imaginary part: A302662. Sequence in context: A140354 A155673 A000833 * A178261 A054329 A112503 Adjacent sequences: A302658 A302659 A302660 * A302662 A302663 A302664 KEYWORD sign AUTHOR Seiichi Manyama, Apr 11 2018 STATUS approved

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

Last modified May 25 14:05 EDT 2024. Contains 372788 sequences. (Running on oeis4.)