1002212domain: NAppears in sequencesPositive numbers k such that k and 2*k are anagrams of each other in base 3 (k is written here in base 3).at n=24A0230583*Sum_{k>=0} k^n/binomial(2*k, k) = Pi*sqrt(3)*q(n) + a(n) for some rational sequence (q(n)).at n=11A098830