# A304781 (b-file synthesized from sequence entry) 0 1 1 2 2 6 3 21 4 75 5 274 6 1016 7 3807 8 14377 9 54627 10 208584 11 799669 12 3076167 13 11867511 14 45897145 15 177888715 16 690770763 17 2686879415 18 10466761637 19 40828165464 20 159453481037 21 623427464093 22 2439907421914 23 9557831470082 24 37472409664888 25 147028505564603 26 577302980976146