# A276368 (b-file synthesized from sequence entry) 0 1 1 3 2 9 3 36 4 135 5 567 6 2268 7 9720 8 40095 9 173745 10 729729 11 3184272 12 13533156 13 59337684 14 254304360 15 1118939184 16 4825425231 17 21288640725 18 92250776475 19 407845538100 20 1774128090735 21 7856852973255 22 34284449337840 23 152044079672160 24 665192848565700 25 2953456247631708 26 12949769701154412 27 57554532005130720 28 252828837022538520 29 1124652412962326520 30 4948470617034236688 31 22028675650023376224