2147483588domain: NAppears in sequencesLet r(n) be the real positive root of Sum_{k=1..n} x^k = 1, then a(n) = round(1/(r(n) - 1/2)).at n=28A079460Row sums of triangle A132731.at n=30A132732Row sums of triangle A132823.at n=31A132824