# A138898 (b-file synthesized from sequence entry)
3 60
4 840
5 30240
6 1995840
7 207567360
8 31135104000
9 6351561216000
10 1689515283456000
11 567677135241216000
12 235018333989863424000
13 117509166994931712000000
14 69800445194989436928000000
15 48581109855712648101888000000
16 39156374543704394370121728000000
17 36180490078382860397992476672000000
18 37989514582302003417892100505600000000
19 44979585265445572046784246998630400000000
20 59642930061980828534035911520183910400000000