# A075220 (b-file synthesized from sequence entry) 1 1 2 1 3 1 4 3 5 4 6 12 7 21 8 56 9 111 10 261 11 462 12 1431 13 1875 14 4696 15 9410 16 20099 17 24034 18 77884 19 79925 20 266786 21 358096 22 658594 23 796571 24 3227163 25 2980476 26 6268017 27 10167660 28 24321735 29 21477012 30 85964698