# A168937 (b-file synthesized from sequence entry)
0 1
1 20
2 380
3 7220
4 137180
5 2606420
6 49521980
7 940917620
8 17877434780
9 339671260820
10 6453753955580
11 122621325156020
12 2329805177964380
13 44266298381323220
14 841059669245141180
15 15980133715657682420