# A063026 (b-file synthesized from sequence entry) 0 0 1 1 2 1 3 2 4 4 5 9 6 21 7 52 8 135 9 368 10 1045 11 3068 12 9230 13 28245 14 87414 15 272544 16 854012 17 2685897 18 8473107 19 26805994 20 85045674 21 270599945 22 863529480 23 2763745020 24 8870777955 25 28550721966 26 92128996782 27 298004209496 28 966085311052