167229domain: NAppears in sequencesa(n) = a(n-1) + a(n-3), with a(0) = a(1) = 1, a(2) = 5.at n=30A011761Number of chiral pairs of color loops of length n with exactly 3 different colors.at n=13A305542Expansion of (1/x) * Series_Reversion( x * (1-x)^2 * (1-x-x^3)^2 ).at n=6A368968