1677720domain: NAppears in sequencesa(n) = 4 * floor(24*2^n/15) = 4*A077854(n).at n=18A102652Binary XOR of 2^k - (-1)^k as k varies from 1 to n.at n=21A199402Binary XOR of (2^k - (-1)^k)/3 as k varies from 1 to n.at n=21A199403Records in A175046.at n=34A319422