4363065domain: NAppears in sequencesDenominators of Blandin-Diaz compositional Bernoulli numbers C_2,n.at n=18A1330052-parking triangle T(r, i, 2) read by rows: T(r, i, k) = (r + 1)^(i-1)*binomial(k*(r + 1) + r - i - 1, r - i) with k = 2 and 0 <= i <= r.at n=40A329058