# A290738 (b-file synthesized from sequence entry)
5 0
6 1
7 758
8 154741
9 20762073
10 2323972976
11 240154383596
12 24109617950208
13 2417940914461280
14 246158020396388352
15 25680108955640400000
16 2760762217507260989440
17 306854769192894226859776
18 35326258772832011339956224
19 4216066596599500902861091840
20 521775392548443914240000000000