# A060042 (b-file synthesized from sequence entry) 0 1 1 2 2 30 3 420 4 5766 5 79356 6 1105868 7 15656200 8 225102726 9 3280346476 10 48334394756 11 718513364856 12 10756854024476 13 161965917024856 14 2450288410421976 15 37217243114489616 16 567231522298906566 17 8671114430550556236 18 132902927261011018836 19 2041798846285571043096