# A377233 (b-file synthesized from sequence entry) 0 1 1 6 2 51 3 456 4 4191 5 39174 6 370329 7 3529284 8 33838854 9 325978044 10 3152058630 11 30572797920 12 297294956070 13 2897207397420 14 28286321963370 15 276611636831640 16 2708781551458665 17 26559205696513590 18 260695647288540915 19 2561413004129212440 20 25188928968792165495