# A307251 (b-file synthesized from sequence entry) 1 1 2 3 3 7 4 21 5 56 6 63 7 168 8 252 9 504 10 819 11 2184 12 3276 13 6552 14 15561 15 32760 16 62244 17 124488 18 482391 19 622440 20 1929564 21 3859128 22 17848467 23 19295640 24 71393868 25 142787736 26 713938680 27 3069936324 28 6139872648 29 30699363240 30 187266115764 31 337692995640 32 374532231528