|
%I #9 Jun 20 2018 22:14:18
%S 1,4,9,22,46,109,237,571,1362,3459,8881,23698,63846,175489,485941,
%T 1359240,3821170,10803787,30654681,87295726,249262766,713583861,
%U 2047210813,5885081941,16947632202,48885431563,141220349049
%N "DIK" (bracelet, indistinct, unlabeled) transform of 1,3,5,7...
%H Andrew Howroyd, <a href="/A032288/b032288.txt">Table of n, a(n) for n = 1..200</a>
%H C. G. Bower, <a href="/transforms2.html">Transforms (2)</a>
%H <a href="/index/Br#bracelets">Index entries for sequences related to bracelets</a>
%o (PARI) seq(n)={Vec(x*(1 + 2*x - x^2 + 2*x^3 + 2*x^4 + 2*x^5)/((1 - x)^2*(1 - 3*x^2)) + sum(d=1, n, eulerphi(d)/d*log((1-x^d)^2/(1-3*x^d) + O(x*x^n))))/2} \\ _Andrew Howroyd_, Jun 20 2018
%K nonn
%O 1,2
%A _Christian G. Bower_
|
