37723domain: NAppears in sequencesNumber of strong primes < 10^n.at n=5A159687Negabinary Keith numbers.at n=21A188381Triangle, read by rows, where the g.f. of row n equals Product_{k=0..n-1} (1 + (2*k+1)*x + x^2) for n>0 with a single '1' in row 0.at n=42A291845Central terms in irregular triangle A291845.at n=6A291846