# A302448 (b-file synthesized from sequence entry) 0 1 1 1 2 6 3 21 4 70 5 210 6 646 7 1881 8 5446 9 15295 10 42355 11 115036 12 308312 13 814023 14 2123431 15 5471967 16 13949888 17 35194914 18 87952796 19 217803302 20 534794576 21 1302545064 22 3148316746 23 7554386885 24 18001627175 25 42613759083 26 100240372671 27 234371794954 28 544812235887