# A187942 (b-file synthesized from sequence entry)
1 1
2 3
3 392
4 11250
5 131769
6 501126
7 15780962
8 131079601
9 1568294784
10 30261936128
11 2966827112704
12 119439360000000
13 238660389865072
14 6566468639062500
15 39226324511250000
16 73141605808805632
17 162778775259375000
18 282080144308712092