2856960

Appears in sequences

• G.f.: 8th root of weight enumerator of [64,42,8] Reed-Muller code RM(3,6).at n=7A110844
• Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 801", based on the 5-celled von Neumann neighborhood.at n=10A273574
• Irregular triangle read by rows. T(n,k) is the number of n X n matrices over GF(2) whose characteristic polynomial is a product of k distinct squarefree irreducible factors.at n=16A344873
• 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=19A374898