45065

Appears in sequences

• a(n+1) = Sum_{k=0..sqrt(n)} a(k) * a(n-k).at n=16A030041
• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 38.at n=5A031626
• Alternating square row sums of the table A072233 (A008284).at n=35A238313
• The number of 2-compositions of n of Carlitz type.at n=10A275079
• Expansion of Sum_{i>=1} mu(i)^2*x^i/(1 - x^i) * Product_{j>=i} 1/(1 - mu(j)^2*x^j), where mu() is the Moebius function (A008683).at n=38A284829
• a(n) is the number of unlabeled rank-3 graded lattices with 4 coatoms and n atoms.at n=40A322599