# A027212 (b-file synthesized from sequence entry) 0 1 1 3 2 8 3 23 4 55 5 144 6 328 7 816 8 1808 9 4358 10 9485 11 22377 12 48097 13 111720 14 237917 15 546161 16 1154827 17 2626624 18 5522464 19 12467540 20 26092324 21 58546544 22 122059348 23 272479782 24 566242186 25 1258568324 26 2608232758 27 5775620396 28 11940756076