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A333139
The number of regions inside a decagon formed by the straight line segments mutually connecting all vertices and all points that divide the sides into n equal parts.
6
220, 4220, 25220, 84280, 217800, 456640, 873090, 1501520, 2436020, 3736540, 5523970, 7830800, 10879460, 14665340, 19398660, 25173960, 32203320, 40502280, 50458120, 61995140, 75517160
OFFSET
1,1
COMMENTS
The terms are from numeric computation - no formula for a(n) is currently known.
CROSSREFS
Cf. A332417 (n-gons), A332418 (vertices), A332419 (edges), A007678, A092867, A331452, A331929.
Sequence in context: A258537 A027797 A055663 * A022042 A095702 A271674
KEYWORD
nonn,more
AUTHOR
EXTENSIONS
a(6)-a(21) from Lars Blomberg, May 18 2020
STATUS
approved