71546

Appears in sequences

• a(n) = (2*n-1)*(n^2 -n +2)/2.at n=41A063488
• 0 together with numbers k such that 4*R_k - 3 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=15A099412
• Number of tilings of a 10 X n rectangle using integer-sided square tiles of area > 1.at n=19A226374
• Number of unlabeled semidistributive lattices with n elements.at n=13A377408