# A030910 (b-file synthesized from sequence entry) 1 2 2 4 3 12 4 49 5 249 6 1499 7 10493 8 83946 9 755519 10 7555194 11 83107140 12 997285682 13 12964713872 14 181505994212 15 2722589913192 16 43561438611080 17 740544456388374 18 13329800214990740 19 253266204084824069 20 5065324081696481381