|
%I #8 Oct 02 2019 12:07:20
%S 1,1,1,1,3,4,10,14,36,50,138,202,562,876,2589,4134,12828,21146,69115,
%T 115974,398619,678554,2450202,4213596,15939338,27644432,109304036,
%U 190899270,787013630,1382958544,5931819804,10480142146,46673246440,82864869600,382473261356
%N Number of primitive (period n) periodic palindromic structures of length n using an infinite alphabet.
%C See A285037 for additional information. Permuting the symbols will not change the structure.
%H Andrew Howroyd, <a href="/A285042/b285042.txt">Table of n, a(n) for n = 0..500</a>
%F a(n) = Sum_{d | n} mu(n/d) * A285013(d) for n > 0.
%o (PARI) \\ Requires T from A285037.
%o seq(n)={my(A=T(n)); concat([1], vector(n, i, vecsum(A[i, ])))} \\ _Andrew Howroyd_, Oct 02 2019
%Y Row sums of A285037.
%Y Cf. A285013.
%K nonn
%O 0,5
%A _Andrew Howroyd_, Apr 08 2017
%E a(0)=1 prepended and terms a(28) and beyond from _Andrew Howroyd_, Oct 02 2019
|
