# A027487 (b-file synthesized from sequence entry)
2 1
3 12
4 215
5 5700
6 212464
7 10645152
8 691560092
9 56600396640
10 5701663652256
11 693513787887360
12 100238236943757120
13 16984716659427928320
14 3334997046159250716672
15 751255152802084700098560
16 192454224298697834146195200
17 55636762557552859712661811200