44466

Appears in sequences

• Number of 2-factors in C_5 X P_n.at n=5A003730
• 3-almost primes with semiprime digits (digits 4, 6, 9 only).at n=30A111494
• Numbers with digits 4 and 6 only.at n=33A284634
• a(n) = Sum_{k=0..n} (2^k + 1) * (2^k + 2) / 2.at n=8A346295
• Expansion of g.f. A(x) satisfying Sum_{n>=0} Product_{k=1..n} (x^k + 2*A(x)) = 1 + 3*Sum_{n>=1} x^(n*(n+1)/2).at n=11A370142