928972800domain: NAppears in sequencesDenominator of (2/Pi)*Integral_{0..inf} (sin x / x)^n dx.at n=10A002298a(n) = n! * C(n+2, 2) * 2^(n+1).at n=8A014297Expansion of e.g.f. x*(1-x)/(1-2*x).at n=10A052564E.g.f. x^2*(1+x-2x^2)/(1-2x).at n=10A052638a(n) is the least k > 0 such that A303809(k) = 2^n.at n=23A303819