The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A371376 Irregular table read by rows: place n equally space points around the circumference of a circle and then, for each pair of points, draw two distinct circles, whose radii are the same as the first circle, such that both points lie on their circumferences. T(n,k), k>=2, gives the number of k-sided regions formed. 7
 1, 6, 3, 8, 0, 1, 15, 30, 5, 1, 18, 30, 14, 147, 35, 7, 7, 1, 8, 152, 48, 8, 0, 0, 1, 27, 351, 171, 36, 27, 10, 390, 200, 10, 40, 0, 0, 0, 1, 22, 693, 649, 33, 77, 0, 0, 0, 0, 1, 12, 780, 408, 0, 48, 26, 1404, 1183, 234, 169, 0, 0, 0, 0, 0, 0, 1, 14, 1498, 1274, 224, 154, 14, 14, 0, 0, 0, 0, 0, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 2,2 COMMENTS See A371373 and A371374 for images of the graphs. LINKS Table of n, a(n) for n=2..80. FORMULA Sum of row(n) = A371374(n). EXAMPLE The table begins: 1; 6, 3; 8, 0, 1; 15, 30, 5, 1; 18, 30; 14, 147, 35, 7, 7, 1; 8, 152, 48, 8, 0, 0, 1; 27, 351, 171, 36, 27; 10, 390, 200, 10, 40, 0, 0, 0, 1; 22, 693, 649, 33, 77, 0, 0, 0, 0, 1; 12, 780, 408, 0, 48; 26, 1404, 1183, 234, 169, 0, 0, 0, 0, 0, 0, 1; 14, 1498, 1274, 224, 154, 14, 14, 0, 0, 0, 0, 0, 1; 45, 2310, 2400, 390, 255, 15; 16, 2736, 2032, 656, 320, 0, 32, 0, 0, 0, 0, 0, 0, 0, 1; 34, 3978, 4097, 969, 493, 17, 34, 0, 0, 0, 0, 0, 0, 0, 0, 1; 18, 4410, 3078, 972, 468, 36, 18; 76, 6365, 6365, 1596, 855, 95, 76, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1; 20, 6840, 6000, 2100, 780, 60, 100, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1; 63, 8946, 10395, 2751, 924, 126, 147; 22, 10076, 9218, 3674, 1166, 22, 132, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1; 46, 13156, 14996, 4347, 1702, 92, 138, 23, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \\ 0, 0, 1; 24, 14232, 13296, 4512, 1440, 96, 240; 100, 19075, 19850, 6975, 2675, 150, 175, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \\ 0, 0, 0, 1; . . CROSSREFS Cf. A371373 (vertices), A371374 (regions), A371375 (edges), A371377 (vertex crossings), A371274, A331450, A359009, A359061. Sequence in context: A070392 A248268 A115371 * A096253 A182566 A115287 Adjacent sequences: A371373 A371374 A371375 * A371377 A371378 A371379 KEYWORD nonn,tabf AUTHOR Scott R. Shannon, Mar 20 2024 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 August 9 11:50 EDT 2024. Contains 375042 sequences. (Running on oeis4.)