19563domain: NAppears in sequencesNumber of (n+3) X 10 0..1 matrices with each 4 X 4 subblock idempotent.at n=14A224567Expansion of e.g.f. 1/(1 - sinh(2*x))^(1/2).at n=6A235134a(n) = Sum_{k=0..n} C(n,k) * (1 + 3^k)^(n-k).at n=5A244755Numbers k such that 4 is the smallest decimal digit of k^3.at n=30A291643