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A027268 as a simple table

na(n)
10
26
320
4180
5644
65502
720292
8174456
9654632
105673140
1121528000
12187675644
13717800628
146284986554
1524178479500
16212408191568
17820811282352
187229648901024
1928037230854096
20247468885359240
21962488105227160
228510025522045036
2333177800527098040
24293772371437293720

[0,6,20,180,644,5502,20292,174456,654632,5673140,
 21528000,187675644,717800628,6284986554,
 24178479500,212408191568,820811282352,
 7229648901024,28037230854096,247468885359240,
 962488105227160,8510025522045036,
 33177800527098040,293772371437293720]