# A138901 (b-file synthesized from sequence entry) 1 1 2 3 3 7 4 17 5 41 6 87 7 187 8 412 9 937 10 2162 11 5298 12 12354 13 29994 14 74094 15 182994 16 444354 17 1081419 18 2737788 19 6745792 20 16765802 21 41815827 22 105943891 23 261683475 24 655537299 25 1668304275