# A137684 (b-file synthesized from sequence entry) 0 1 1 10 2 90 3 882 4 8474 5 82650 6 803894 7 7858034 8 76833498 9 752970088 10 7385132830 11 72529933448 12 712899726610 13 7013548687126 14 69048242750358 15 680252491600274 16 6705715693296522 17 66139925760268608 18 652678937193274320