108610domain: NAppears in sequencesNumber of planar partitions of n with exactly 2 rows.at n=27A091356Numbers k such that (134*10^k + 7)/3 is prime.at n=26A282975a(n) = a(n-1) + a(n-2) + 2*a(floor(n/2)) + 3*a(floor(n/3)) + ... + n*a(floor(n/n)), where a(0) = 1, a(1) = 1, a(2) = 1.at n=19A298369