# A117186 (b-file synthesized from sequence entry) 0 1 1 2 2 5 3 9 4 21 5 38 6 86 7 157 8 349 9 642 10 1410 11 2610 12 5682 13 10572 14 22860 15 42717 16 91869 17 172298 18 368906 19 694054 20 1480486 21 2793012 22 5938740 23 11230834 24 23813746 25 45131348 26 95462996 27 181268292 28 382594884 29 727747608 30 1533053976