# A337043 (b-file synthesized from sequence entry) 0 1 1 0 2 2 3 9 4 112 5 1875 6 43416 7 1310946 8 49778688 9 2313362673 10 128894500000 11 8469572721533 12 647341071298560 13 56871349337125648 14 5684260661585401728 15 640631299771142578125 16 80788871646072851660800 17 11323828537291632967145015 18 1753760620207362607774290432