# A005510 (b-file synthesized from sequence entry) 1 3 2 10 3 31 4 101 5 311 6 962 7 3132 8 10202 9 31412 10 96722 11 299183 12 925445 13 3012985 14 9809425 15 31952665 16 104080805 17 320465225 18 986713745 19 3038231465 20 9355145285 21 28937578127 22 89510467490 23 276877411436 24 856448448026 25 2788351903326 26 9078078610226 27 29555650383626