# A027311 (b-file synthesized from sequence entry)
2 4
3 43
4 396
5 3465
6 29730
7 253008
8 2145968
9 18184052
10 154119660
11 1307389666
12 11104039000
13 94441581936
14 804428517984
15 6862216318250
16 58625961078432
17 501592568400544
18 4297633705136632
19 36872583343109643
20 316774930400206020