36565domain: NAppears in sequencesa(n) = Sum_{k=0..floor(n/5)} C(n-3*k,2*k) * 2^k.at n=23A098577D'Agapeyeff cipher.at n=17A135209Numbers k that divide A003714(k).at n=11A276488Numbers k such that A339549(k) = A339549(k+1).at n=24A339550