715680

Appears in sequences

• a(n) is the number of 2 X 2 matrices over Z_p with determinant in {1,-1} where p = prime(n).at n=19A262354
• Expansion of e.g.f. (1/x) * Series_Reversion( x*(1 + x^2*log(1-x))^2 ).at n=8A376436