53447

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 21 ones.at n=34A031789
• Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 11000-01110-00011 pattern in any orientation.at n=13A147186
• G.f. is the polynomial (Product_{k=1..16} (1 - x^(3*k)))/(1-x)^16.at n=6A162636