# A218685 (b-file synthesized from sequence entry) 0 1 1 0 2 1 3 6 4 34 5 270 6 3415 7 31230 8 681026 9 6949920 10 230637870 11 2546120514 12 119281951006 13 1394371349490 14 87612425583018 15 1069010047029672 16 86763885548985810 17 1094149501538197236 18 111443560982774811439 19 1442387644419293694144 20 180179254059921915232864