# A006787 (b-file synthesized from sequence entry) 1 1 2 2 3 3 4 6 5 11 6 23 7 48 8 114 9 293 10 869 11 2963 12 12066 13 58933 14 347498 15 2455693 16 20592932 17 202724920 18 2322206466 19 30743624324 20 468026657815 21 8161170076257