# A168893 (b-file synthesized from sequence entry) 0 1 1 24 2 552 3 12696 4 292008 5 6716184 6 154472232 7 3552861336 8 81715810728 9 1879463646744 10 43227663875112 11 994236269127576 12 22867434189934248 13 525950986368487704 14 12096872686475217192 15 278228071788929995416