87644

Appears in sequences

• a(1) = 0; and for n > 1, a(n) = 2*a(A285712(n)) + [0 == (n mod 3)].at n=33A292590
• Base-2 expansion of a(n) encodes the steps where numbers of the form 6k+5 are encountered when map x -> A252463(x) is iterated down to 1, starting from x=n.at n=66A292945
• a(n) = A115004(2n)/4.at n=18A331760