# A147998 (b-file synthesized from sequence entry)
1 1
2 3
3 12
4 72
5 576
6 5184
7 57024
8 684288
9 9580032
10 153280512
11 2605768704
12 49509605376
13 1039701712896
14 22873437683712
15 548962504409088
16 13724062610227200
17 370549690476134400
18 10745941023807897600
19 322378230714236928000
20 10316103382855581696000
21 340431411634234195968000
22 11915099407198196858880000
23 440858678066333283778560000
24 16752629766520664783585280000
25 670105190660826591343411200000