# A180278 (b-file synthesized from sequence entry)
0 0
1 1
2 3
3 13
4 47
5 447
6 2163
7 24263
8 241727
9 2923783
10 16485763
11 169053487
12 4535472963
13 36316463227
14 879728844873
15 4476534430363
16 119919330795347
17 1374445897718223
18 106298577886531087