140676domain: NAppears in sequencesSum_{k=0..n} k*binomial(n,k)^2*binomial(2*k,k).at n=6A226312Numbers k such that k - 13, k + 1, k + 5, k + 7, and k + 13 are all prime.at n=18A281937a(n) = 10*binomial(n,5) + 6*binomial(n,4) + binomial(n,3) + binomial(n,2).at n=19A380445