# A090577 (b-file synthesized from sequence entry)
0 1
1 3
2 9
3 24
4 72
5 174
6 519
7 1284
8 3813
9 9300
10 27462
11 66666
12 195674
13 470886
14 1372946
15 3280224
16 9495005
17 22487511
18 64615934
19 151714911