# A007872 (b-file synthesized from sequence entry) 1 1 2 1 3 1 4 4 5 9 6 27 7 89 8 304 9 944 10 3259 11 11081 12 38044 13 132921 14 467771 15 1650279 16 5907280 17 21183657 18 76488912 19 277631065 20 1012588940 21 3707127319 22 13632296219 23 50292158921 24 186165033296 25 691181554768 26 2573423459611