636289024

Appears in sequences

• Number of 2-elements orbits of S3 action on irreducible polynomials of degree 3n, n > 0, over GF(2).at n=35A165920
• Index of the closure of a triangle group Delta, associated with billiards in a regular n-gon, in the adelic group Gamma = SL_2(O), where O is the profinite completion of Z[zeta + zeta^{-1}] and zeta is the n-th root of unity.at n=24A374898