# A253712 (b-file synthesized from sequence entry)
1 1
2 4098
3 539636
4 17852390
5 279305769
6 2717541484
7 18997064400
8 103996064052
9 471424600185
10 1838853136318
11 6344710049172
12 19766667410282
13 56486709893873
14 149900664752760
15 373060957502272
16 877696226962440
17 1964953733652369
18 4209042621768474
19 8666446428950740
20 17219850236133006
21 33129081554701913
22 61893315504320036