-1141domain: ZAppears in sequencesExpansion of 1/(1-x+2*x^2+2*x^3).at n=22A077956Expansion of 1/(1+x+2*x^2-2*x^3).at n=22A077977Numerator of Bernoulli(n, 3/10).at n=5A158998a(n) = (-1)^(n-3)*binomial(n,3) - 1.at n=17A216414Partial alternating sums of the sigma_2 function: a(n) = Sum_{k=1..n} (-1)^(k+1) * sigma_2(k).at n=23A379921