# A334162 (b-file synthesized from sequence entry) 0 1 1 2 2 6 3 35 4 352 5 5307 6 111592 7 3117900 8 111259904 9 4912490375 10 261954304224 11 16560019685937 12 1222893826048000 13 104189533522270666 14 10132262911996769408 15 1114216450970154278543 16 137427598621356912082944 17 18877351974681584403701519 18 2869969478954093766868948480