182988domain: NAppears in sequencesa(n) = integer nearest a(n-1)/(sqrt(7) - 2), where a(1) = 1.at n=27A024567Even numbers (not equal to 2) to the left of the central elements of the (2,3)-Pascal triangle A029600.at n=38A029613Number of set partitions of {1..n} such that the median of medians of the blocks is (n+1)/2.at n=10A361863