351634domain: NAppears in sequencesBases with smallest unhappy number (in that base) > 2.at n=13A161874Square array T(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of e.g.f. 1/(1 - Sum_{j=1..k} (exp(j*x) - 1)/j).at n=50A355427