# A252864 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 3 4 5 5 8 6 12 7 18 8 25 9 35 10 51 11 75 12 110 13 161 14 236 15 346 16 507 17 743 18 1089 19 1596 20 2339 21 3428 22 5024 23 7363 24 10791 25 15815 26 23178 27 33969 28 49784 29 72962 30 106931