# A047686 (b-file synthesized from sequence entry) 0 1 1 3 2 90 3 2835 4 18900 5 66825 6 1915538625 7 127702575 8 186080895000 9 350813659321125 10 7656647326453125 11 3018906660144375 12 1211517431782539131250 13 144228265688397515625 14 564653660170076273671875 15 84913182070036240111050234375 16 499921764568178729658131250000