142844426789domain: NAppears in sequencesSomos-5 sequence: a(n) = (a(n-1) * a(n-4) + a(n-2) * a(n-3)) / a(n-5), with a(0) = a(1) = a(2) = a(3) = a(4) = 1.at n=21A006721Subsequence of terms of odd index of the Somos-5 sequence.at n=10A097496