841146804577domain: NAppears in sequencesBessel polynomial y_n(x) evaluated at x=1.at n=12A001515Numerators of numbers with g.f. exp(1-(1-x)^(1/2)).at n=13A143991a(0) = a(1) = 1; thereafter a(n) = (2*n-3)*a(n-1) + a(n-2).at n=13A144301