204620705domain: NAppears in sequencesNumerator of Sum_{k=1..n} 1/(k * 2^k).at n=13A068566Numerator of the polynomial A_l(x) = sum_{d=1..l-1} x^(l-d)/d for index l=2n+1 evaluated at x=2.at n=6A145611a(n) = numerator of polynomial of genus 1 and level n for m = 2.at n=14A145656