# A000380 (b-file synthesized from sequence entry) 3 6 4 8 5 40 6 176 7 1421 8 10352 9 93114 10 912920 11 9929997 12 117970704 13 1521176826 14 21150414880 15 315400444070 16 5020920314016 17 84979755347122 18 1523710321272384 19 28851091193764023 20 575253584489378040 21 12047084261153160394 22 264377395040950523112 23 6066972656940255290199