# A307528 (b-file synthesized from sequence entry) 0 1 1 0 2 1 3 1 4 4 5 9 6 27 7 76 8 226 9 680 10 2078 11 6441 12 20153 13 63684 14 202732 15 649930 16 2095854 17 6794684 18 22131765 19 72393439 20 237703654 21 783198068 22 2588645047 23 8580674778 24 28517805357 25 95009277576 26 317242351135 27 1061500510809 28 3558683892258 29 11952025977378 30 40209157279701