# A143357 (b-file synthesized from sequence entry)
1 0
2 0
3 0
4 0
5 0
6 2
7 12
8 70
9 448
10 3298
11 27490
12 255876
13 2631876
14 29652480
15 363242880
16 4807626352
17 68375130352
18 1040021719578
19 16848351857178
20 289631191449600
21 5266021662720000
22 100970241446066086
23 2036233202495666086
24 43086694564808294400
25 954536002666522214400
26 22095740802465792000000