2173358880

Appears in sequences

• a(n) = sqrt(2)*( (3+2*sqrt(2))^n - (3-2*sqrt(2))^n ).at n=12A081554
• a(n) = Pell(n)*A113973(n) for n>=1, with a(0)=1, where A113973 lists the coefficients in phi(x^3)^3/phi(x) and phi() is a Ramanujan theta function.at n=24A209449
• The number of unilevel points (unique points at their height) on Delannoy paths ending when x = n.at n=24A371596