55315679788domain: NAppears in sequencesExpansion of (1-x)^2/(1 - 4*x + 3*x^2 - x^3).at n=22A052544INVERT transform of [1, 0, 1, 3, 9, 27, 81, ...].at n=23A204200a(n) = A000930(n*(n+1)/2), where A000930 is Narayana's cows sequence.at n=11A231621