61516459domain: NAppears in sequencesa(n) = n * 4^(n-1) + (2*4^n + 1) / 3.at n=12A087449a(n) = a(n-1) + 4*a(n-2) - 4*a(n-3) for n>3.at n=26A136336a(n) = 5*a(n-1) - 9*a(n-2) + 8*a(n-3) - 4*a(n-4), with a(0)=0, a(1)=0, a(2)=0, a(3)=1.at n=24A137221a(n) = (11*4^n + 1)/3.at n=12A199210a(0) = 4, a(n) = 2*a(n-1) + (-1)^n.at n=24A383953