54274domain: NAppears in sequencesNumber of tilings of a 4 X 4 X n box using 4n bricks of shape 4 X 1 X 1.at n=9A233291a(n) = Sum_{d|n} (d!)^(n/d-1).at n=15A356543Numbers k such that (prime(j)-1)^2 + 1 is prime for k <= j <= k + 2.at n=33A376522