# A367097 (b-file synthesized from sequence entry) 0 1 1 4 2 12 3 30 4 60 5 210 6 330 7 660 8 2730 9 3570 10 6270 11 12540 12 53130 13 79170 14 110670 15 221340 16 514140 17 1799490 18 2284590 19 4196010 20 6750870 21 13501740 22 37532220 23 97350330 24 131362770 25 189620970 26 379241940 27 735844830 28 1471689660