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 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #11 Jun 20 2020 14:13:43
%S 1,10,11,60,131,90,276,310,326,510,706,580,981,1070,1086,1390,1721,
%T 1320,2136,2250,2311,2730,3176,2900,3746,3900,3956,4530,5086,4690,
%U 5821,5980,6061,6760,7451,6720,8286,8540,8621,9420,10266,9700,11241,11510,11616,12560
%N a(n) is the number of regions formed by n-secting the angles of a pentagon.
%H Lars Blomberg, <a href="/A335553/b335553.txt">Table of n, a(n) for n = 1..200</a>
%H Lars Blomberg, <a href="/A335553/a335553.png">Illustration for n=3</a>
%H Lars Blomberg, <a href="/A335553/a335553_1.png">Illustration for n=4</a>
%H Lars Blomberg, <a href="/A335553/a335553_2.png">Illustration for n=17</a>
%H Lars Blomberg, <a href="/A335553/a335553_3.png">Illustration for n=18</a>
%Y Cf. A331929 (n-sected sides, not angles), A335554 (vertices), A335555 (edges), A335556 (ngons).
%K nonn
%O 1,2
%A _Lars Blomberg_, Jun 14 2020