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A023940 as a simple table

na(n)
01
10
27398
3175104
41820448
510506240
646589382
7155022336
8465542694
91157492736
102774172672
115765465088
1211929117248
1321932052480
1440953956940
1568918860800
16119138987808
17187615014912
18305761893030
19456635833344
20710329749696
211017103417344
221522382017536

[1,0,7398,175104,1820448,10506240,46589382,
 155022336,465542694,1157492736,2774172672,
 5765465088,11929117248,21932052480,40953956940,
 68918860800,119138987808,187615014912,
 305761893030,456635833344,710329749696,
 1017103417344,1522382017536]