# A097120 (b-file synthesized from sequence entry) 0 1 1 1 2 1 3 1 4 4 5 13 6 31 7 61 8 115 9 232 10 505 11 1117 12 2413 13 5089 14 10660 15 22477 16 47779 17 101833 18 216619 19 459568 20 974017 21 2065465 22 4383769 23 9307633 24 19759108 25 41934589 26 88985383 27 188834389 28 400758931 29 850562776 30 1805202073 31 3831179989