47372domain: NAppears in sequencesMean (rounded) of primes below 10^n.at n=4A092800Number of (n+2) X (4+2) 0..1 arrays with no 3 X 3 subblock diagonal sum 0 and no antidiagonal sum 3 and no row sum 0 or 3 and no column sum 0 or 3.at n=20A258962a(n) = n * Sum_{d|n} binomial(d+4,5)/d.at n=19A343546