93214domain: NAppears in sequencesExpansion of a modular function.at n=27A006707a(n) = 3 + 7*a(n-2) + sqrt(1 + 48*a(n-2) + 48*a(n-2)^2), with a(1) = 0, a(2) = 0, a(3) = 2.at n=10A103625Principal diagonal of the convolution array A213505.at n=10A213546a(n) = Sum_{k=1..floor(n/2)} k^2 * (n-k)^2.at n=21A337173