# A306228 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 28 4 278 5 3564 6 55928 7 1037708 8 22217720 9 539070560 10 14616331912 11 437960845728 12 14370870516352 13 512497731949840 14 19736969633949568 15 816329819676996352 16 36089654605723837664 17 1698341924904555647808 18 84761545323838638225152 19 4471847161631552852257472