# A137681 (b-file synthesized from sequence entry) 1 1 2 2 3 4 4 10 5 23 6 56 7 132 8 316 9 752 10 1793 11 4272 12 10183 13 24266 14 57833 15 137828 16 328475 17 782827 18 1865651 19 4446255 20 10596406 21 25253567 22 60184809 23 143433647 24 341833954 25 814665553 26 1941527332 27 4627086990 28 11027366781 29 26280642313 30 62632555360 31 149267165702