27578880

Appears in sequences

• 3-infinitary perfect numbers k: 3-i-sigma(k) = 2*k, where 3-i-sigma = A049418.at n=4A038182
• a(n) = L(n) * n! where L(n) are the Lucas numbers.at n=9A100404
• A triangular sequence from umbral calculus expansion of _Simon Plouffe_'s rational polynomial for A002890: p(x,t) = exp(x*t)*(1 - 6*t + 9*t^2 - 4*t^3 + t^4)/(4*t - 1)/(2*t - 1).at n=47A137514