1793853domain: NAppears in sequencesa(n+1) = floor(a(n) * Sum_{k=0..n} 1/a(k)^s), where s = Sum_{k>=0} 1/a(k)^s and a(0)=1; s = 2.260568736857767...at n=19A080135Expansion of Product_{k>=0} 1 / (1 - 3*x^(3^k)).at n=13A374626