103886563462domain: NAppears in sequencesa(n) = A226158(n) - 2*A226158(n+1).at n=21A230324a(n) = -Zeta(1-n)*n*(2^(n+1) - 4) - Zeta(-n)*(n+1)*(2^(n+2) - 2), for n = 0 the limit is understood.at n=22A240485Shifted sequence of second differences of Genocchi numbers.at n=19A278331