990435962880domain: NAppears in sequencesStarting at 1, four-fold convolution of A000400 (powers of 6).at n=15A081144Denominator of Bernoulli(n, 1/6).at n=12A158077Denominator of Bernoulli(n, -1/6).at n=12A158207Denominator of Bernoulli(n, -5/6).at n=12A158301