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Number of nonisomorphic and nonantiisomorphic relations.
1

%I #12 Mar 06 2020 03:18:39

%S 1,2,9,74,1740,149572,48575680,56147642904,229149201466592,

%T 3333310913116926416,174695272793893644765312,

%U 33301710992572083379669646560,23278728241293538748514513208527104

%N Number of nonisomorphic and nonantiisomorphic relations.

%F a(n) = (A000595(n) + A002500(n)) / 2. - _Sean A. Irvine_, Mar 05 2020

%Y Cf. A000595, A002500.

%K nonn,nice

%O 0,2

%A _Christian G. Bower_, Jan 15 1998 and Jun 15 1998