# A203765 (b-file synthesized from sequence entry) 1 1 2 3 3 6 4 49 5 147 6 2028 7 8112 8 159201 9 796005 10 20342448 11 122054688 12 3850078401 13 26950548807 14 1012487793408 15 8099902347264 16 353293863908769 17 3179644775178921 18 157973407966483200 19 1579734079664832000 20 88087149666575064369