# A057970 (b-file synthesized from sequence entry) 1 1 2 8 3 54 4 333 5 1896 6 9874 7 47164 8 207112 9 840323 10 3168506 11 11170331 12 37034409 13 116095018 14 345785753 15 982835676 16 2676217504 17 7005306389 18 17681946594 19 43153532167 20 102080966243 21 234565062960 22 524594120393 23 1143910860870