28105domain: NAppears in sequencesExpansion of (Product_{j>=1} (1-(-x)^j) - 1)^11 in powers of x.at n=17A047649Number of simple labeled graphs on n+2 nodes with exactly n connected components that are trees or cycles.at n=20A215862Numbers k such that k and k+1 are the product of exactly four distinct primes.at n=31A318896