41376domain: NAppears in sequencesNumber of happy numbers without zeros and with digits in nondecreasing order <= 10^n.at n=12A219667Expansion of Product_{n>=1} (1 - x^(3*n))/(1 - x^n)^3 in powers of x.at n=16A273845G.f.: Product_{m>0} (1 + x^m + 2!*x^(2*m) + 3!*x^(3*m)).at n=32A289485