# A148874 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 8 4 29 5 97 6 356 7 1345 8 5312 9 20951 10 84910 11 349614 12 1456834 13 6106706 14 25935852 15 111040569 16 477930029 17 2069560858 18 9025183157 19 39530097395 20 173797714040 21 767680927436 22 3404799777699 23 15144014386727 24 67566885275210 25 302450951239750 26 1357363670407487 27 6105291074781927 28 27528978458057805