A287938 - OEIS

%I #28 Jul 15 2018 07:01:46

%S 1,1,19,2915,2788989,14754820185,402830065455939,54259734183964303995,

%T 34931036957548128175343565,104968042559556881090071537121985,

%U 1445701512369903326110289606343988638195,89942525814858602265845303890518923811304544595,24979493321562411847493262443987087581059026281953954525

%N Integers associated with moments of Rvachëv function.

%C a(n) is equal to the product of (2n-1)!! Product_{k=1..n}(2^(2k)-1)) and A287936(n)/A287937(n), the moment of the Rvachëv function. The Rvachëv function is related to the Fabius function; up(x)=F(x+1) for |x|<1 and up(x)=0 for |x|>=1, where F is the Fabius function.

%H J. Arias de Reyna, <a href="https://arxiv.org/abs/1702.05442">An infinitely differentiable function with compact support:Definition and properties</a>, arXiv:1702.05442 [math.CA], 2017.

%H J. Arias de Reyna, <a href="https://arxiv.org/abs/1702.06487">Arithmetic of the Fabius function</a>, arXiv:1702.06487 [math.NT], 2017.

%F a(n) = (2n-1)!!*Product_{k=1..n}(2^(2k)-1))*A287936(n)/A287937(n).

%t c[0] = 1;

%t c[n_] := c[n] =

%t    Sum[Binomial[2 n + 1, 2 k] c[k], {k, 0, n - 1}]/((2 n + 1) (2^(2 n) - 1));

%t a[n_] := a[n] = c[n] (2 n + 1)!! Product[(2^(2 k) - 1), {k, 1, n}];

%t Table[a[n], {n, 0, 30}]

%t Table[(-1)^n 4^(-n) (2 n)! (2 n + 1)!! Sum[QBinomial[n, k, 1/4] 2^(-k (3 k + 1)/2)/(2 n + k + 1)! Sum[(-1)^ThueMorse[m] (2 m + 1)^(2 n + k + 1), {m, 0, 2^k - 1}], {k, 0, n}], {n, 0, 12}] (* _Vladimir Reshetnikov_, Jul 08 2018 *)

%Y Cf. A272755, A272757, A287936, A287937.

%K nonn

%O 0,3

%A _Juan Arias-de-Reyna_, Jun 03 2017