# A027525 (b-file synthesized from sequence entry) 1 1 2 1 3 8 4 54 5 13500 6 3087000 7 3652264 8 1157625 9 456533 10 166375 11 4492125 12 1728000 13 394444512000 14 240827600093696 15 869479900246125 16 384557787648000 17 90468670208000 18 83064482131968 19 13819853214706176 20 45242839158999552000 21 22447962513858357000