78492domain: NAppears in sequencesE.g.f. satisfies A(x) = (1 + x*exp(x*A(x)))^2.at n=6A161632Number T(n,k) of tilings of a 5 X n rectangle with pentominoes of any shape and exactly k pentominoes of shape Y; triangle T(n,k), n>=0, read by rows.at n=20A247712