# A187997 (b-file synthesized from sequence entry) 1 1 2 5 3 8 4 34 5 88 6 421 7 1696 8 8373 9 40681 10 211234 11 1111148 12 5987390 13 32752144 14 181900825 15 1022304310 16 5807285713 17 33301251729 18 192592146915 19 1122301928144 20 6585197085192 21 38881934489280 22 230894913761474 23 1378357322150656 24 8268192777096128