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!)
 A341764 The number of edges on a 2 by 1 ellipse formed by the straight line segments mutually connecting all points formed by dividing the ellipse into 2n equal angle sectors from its origin. 3
 1, 8, 42, 148, 426, 984, 2022, 3604, 6138, 9492, 14642, 21108, 29902, 40728, 54786, 71604, 92722, 117384, 147578, 181810, 223782, 270808, 326262, 388308, 460446, 540424, 632322, 733364, 848318, 973732, 1115422, 1269108, 1441122, 1626888, 1833406, 2055444, 2300822, 2563544, 2852358, 3160050, 3497562 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS The terms are from numeric computation - no formula for a(n) is currently known. See A341688 for a description of the ellipse and images of the regions, and A341762 for images of the vertices. LINKS Wikipedia, Ellipse. FORMULA a(n) = A341688(n) + A341762(n) - 1. CROSSREFS Cf. A341688 (regions), A341762 (vertices), A341800 (n-gons), A007678, A092867, A255011, A331929, A331931, A333075. Sequence in context: A027903 A231069 A319235 * A256861 A287221 A119965 Adjacent sequences:  A341761 A341762 A341763 * A341765 A341766 A341767 KEYWORD nonn AUTHOR Scott R. Shannon and N. J. A. Sloane, Feb 19 2021 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 November 30 20:17 EST 2021. Contains 349425 sequences. (Running on oeis4.)