%I
%S 6,12,10,24,14,24,18,20,22,60,26,28,30,32,34,36,38,60,42,44,46,48,50,
%T 52,54,56,58,60,62,64,66,68,70,72,74,76,78,80,82,84,86,88,90,92,94,96,
%U 98,100,102,104,106,108,110,112,114,116,118,120,122,124,126,128,130
%N Upper bound for the number of 11 directly conformal maps which a multiplyconnected plane region of finite connectivity n >2 admits onto itself.
%H Maurice Heins, <a href="http://dx.doi.org/10.1090/S000299041946085900">On the number of 11 directly conformal maps which a multiplyconnected plane region of finite connectivity p (>2) admits onto itself</a>, Bull. Amer. Math. Soc. 52 (1946), 454457.
%o (PARI) a(n) = if (n==4, 12, if ((n==6)  (n==8), 24, if ((n==12)  (n==20), 60, 2*n)));
%K nonn
%O 3,1
%A _Michel Marcus_, Apr 25 2016
