354640domain: NAppears in sequencesOne quarter of 9-factorial numbers.at n=4A035017Antichains (or order ideals) in the poset 2*2*2*n or size of the distributive lattice J(2*2*2*n).at n=9A056932Numbers k such that 2^k - k + 1 is prime.at n=24A100361Sum of the divisors of 7^n-1.at n=5A366634