99614720

Appears in sequences

• a(n) = binomial(n,2) * 2^(n-1).at n=20A001815
• Theta series of lattice D20+.at n=9A014747
• a(1) = 4; a(n) = smallest composite number greater than the sum of all previous terms.at n=25A070232
• a(n) = -2*a(n-1) + 4*a(n-3), with a(0) = 1, a(1) = a(2) = 0.at n=30A099212
• Denominators of a BBP-like formula for 4*Pi/sqrt(27).at n=6A260659