26494256091domain: NAppears in sequencesIntegers of the form (2^k + 1)/(2k + 1).at n=12A247094a(n) = (2*(-4)^((p-3)/4) + 1)/p, where p is the n-th prime congruent to 3 mod 4.at n=12A318908a(n) = (2^(A003558(n)) - A332433(n))/(2*n+1), for n >= 0.at n=41A329593a(n) = (2^A195610(n) + 1)/A014657(n), for n >= 1.at n=23A337220