358722domain: NAppears in sequencesa(0)=1, a(n) = sigma_3(2n).at n=34A091986a(n) = sigma_3(3n+2).at n=22A092343a(n) = 14 + floor( (1 + Sum_{j=0..n-1} a(j)) / 2).at n=25A120141Number of set partitions of [n] with distinct block sizes and one of the block sizes is 2.at n=13A327881Partial sums of A006010.at n=26A335648