1241981domain: NAppears in sequencesa(n) = Sum_{i=0..n} i*L(i), where L = A000032.at n=21A097039a(n) = 13*a(n-1) - 65*a(n-2) + 156*a(n-3) - 182*a(n-4) + 91*a(n-5) - 13*a(n-6), with a(1)..a(6) as shown.at n=10A161905