# A147690 (b-file synthesized from sequence entry)
0 1
1 4
2 15
3 80
4 648
5 8437
6 177198
7 6024766
8 331362185
9 29491234554
10 4246737775920
11 989489901789593
12 373037692974676938
13 227552992714552932790
14 224594803809263744664717
15 358677901683394200229554646
16 926823697949890613393169207848