18648630domain: NAppears in sequencesa(n) = (n+1)*binomial(n+7, 7).at n=20A056001Indices of Bernoulli numbers of the form 4k+2 whose fractional part is < 2/3.at n=7A155125Indices of Bernoulli numbers of the form 4k+2 whose fractional part is < 2/3 and is incrementally smallest.at n=3A155126a(n) = 21*binomial(n+6,7).at n=21A266733