-4900domain: ZAppears in sequencesExpansion of 1/((1+x)^7 - x^7).at n=9A049018Triangle read by rows: T(n,k)=(-1)^k*(2n/(2n-k))5^(n-k)*binomial(2n-k,k) (0<=k<=n, n>=1).at n=32A104064Alternating sum of centered 25-gonal numbers.at n=27A270693Expansion of Product_{k>=1} (1-x^k)^((-1)^k*k^2).at n=15A307460