53510

Appears in sequences

• Class numbers associated with terms of A001990.at n=27A001991
• Binomial transform of [1, 4, 6, 4, 1, 1, -1, 1, -1, 1, ...].at n=28A140227
• a(0) = 6, a(1) = 17, a(n+1) = a(n) + a(n-1) for n>0.at n=18A166025
• Expansion of Product_{k>=1} 1/(1 - x^k)^(2^omega(k)), where omega(k) = number of distinct primes dividing k (A001221).at n=25A319130
• a(n) = [x^n] (F(x)/F(-x))^n where F(x) = (1 + x)*(1 + x^3).at n=7A362408