

A340685


The number of regions inside a concave circular triangle formed by the straight line segments mutually connecting all vertices and all points that divide the sides into n equal parts.


5



1, 12, 28, 102, 187, 462, 868, 1590, 3046, 4398, 6541, 8646, 12256, 15336, 20947, 26610, 33478, 41832, 50821, 64710, 77110, 97878, 113932, 136560, 160849, 185220, 216286, 246450, 289945, 324594, 372976, 426936, 472231, 537366, 598606, 685650, 762736, 858546, 943684, 1043442, 1143751, 1258800
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OFFSET

1,2


COMMENTS

The terms are from numeric computation  no formula for a(n) is currently known.


LINKS



CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



