# A367488 (b-file synthesized from sequence entry)
0 1
1 0
2 6
3 36
4 444
5 6540
6 119520
7 2593164
8 65233392
9 1867289868
10 59939612040
11 2132540249532
12 83293357351248
13 3543242182036284
14 163062595422642552
15 8071964230348189260
16 427682380939864204224
17 24149065480351703398572
18 1447640087400503974386504