1978368domain: NAppears in sequencesBinomial transform of heptagonal numbers A000566.at n=14A084899Triangle T(k,n) by rows: n! * A075499(k,n).at n=30A099394E.g.f.: Sum_{n>=0} log(1 + x*exp(2*n*x))^n / n!.at n=7A219118Number of labeled rooted trees on [n] that have a primary branch.at n=7A356259