# A053560 (b-file synthesized from sequence entry) 1 0 2 0 3 0 4 1 5 6 6 14 7 36 8 93 9 252 10 661 11 1782 12 4893 13 13608 14 37890 15 106142 16 298755 17 844182 18 2391732 19 6797196 20 19371684 21 55348596 22 158491993 23 454795398 24 1307534319 25 3765720066 26 10862647236 27 31381000560 28 90780846494 29 262951692390