# A147688 (b-file synthesized from sequence entry)
0 1
1 6
2 44
3 360
4 3088
5 26976
6 237248
7 2091648
8 18456832
9 162915840
10 1438198784
11 12696741888
12 112091336704
13 989587267584
14 8736489783296
15 77129433907200
16 680931492954112
17 6011553766047744
18 53072563389857792
19 468547255228956672