# A006427 (b-file synthesized from sequence entry) 1 20 2 1071 3 26320 4 431739 5 5494896 6 58677420 7 550712668 8 4681144391 9 36786186216 10 271221867098 11 1896796135920 12 12688048319278 13 81709791432384 14 509222462694582 15 3083998029716868 16 18213177504318335 17 105186858991413976 18 595499805083872458 19 3311524095424508480