136681domain: NAppears in sequencesa(n) = a(n-1) + 5*a(n-2), with a(0) = a(1) = 1.at n=12A015440Strong pseudoprimes to base 34.at n=30A020260Strong pseudoprimes to base 39.at n=36A020265Square array A(n,k), n >= 0, k >= 1, read by antidiagonals, where column k is the expansion of e.g.f. exp(Sum_{j=1..k} j^2*x^j).at n=61A293724