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A033143 as a simple table

na(n)
11
27
349
4344
52408
616856
7117993
8825951
95781657
1040471600
11283301200
121983108400
1313881758801
1497172311607
15680206181249
164761443268744
1733330102881208
18233310720168456
191633175041179193
2011432225288254351
2180025577017780457
22560179039124463200
233921253273871242400

[1,7,49,344,2408,16856,117993,825951,5781657,
 40471600,283301200,1983108400,13881758801,
 97172311607,680206181249,4761443268744,
 33330102881208,233310720168456,1633175041179193,
 11432225288254351,80025577017780457,
 560179039124463200,3921253273871242400]