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 A367277 Place n equally spaced points on each side of a square, and join each of these points by a chord to the 3*n new points on the other three sides: sequence gives number of interior vertices in the resulting planar graph. 5
 0, 1, 57, 329, 1317, 2861, 7417, 12801, 23329, 36549, 64625, 80085, 138261, 176829, 233705, 311949, 455205, 513205, 741889, 819509, 1046161, 1310673, 1692869, 1772001, 2315189, 2713893, 3165017, 3552641, 4538729, 4602865, 6015437, 6432553, 7421213, 8550349, 9439481, 10063849, 12635621 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS See A367276 for further information. LINKS Table of n, a(n) for n=0..36. Scott R. Shannon, Image for n = 1. Scott R. Shannon, Image for n = 2. Scott R. Shannon, Image for n = 3. Scott R. Shannon, Image for n = 4. Scott R. Shannon, Image for n = 5. Scott R. Shannon, Image for n = 10. FORMULA a(n) = A367279(n) - A367278(n) - 4*n - 3 (Euler). CROSSREFS Cf. A367276 (interior), A367278 (regions), A367279 (edges). Sequence in context: A048422 A157651 A251263 * A371515 A043399 A038482 Adjacent sequences: A367274 A367275 A367276 * A367278 A367279 A367280 KEYWORD nonn AUTHOR Scott R. Shannon, Nov 11 2023 STATUS approved

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Last modified September 15 03:00 EDT 2024. Contains 375931 sequences. (Running on oeis4.)