# A203765 (b-file synthesized from sequence entry)
1 1
2 3
3 6
4 49
5 147
6 2028
7 8112
8 159201
9 796005
10 20342448
11 122054688
12 3850078401
13 26950548807
14 1012487793408
15 8099902347264
16 353293863908769
17 3179644775178921
18 157973407966483200
19 1579734079664832000
20 88087149666575064369