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A270241 as a simple table

na(n)
01
18
272
3528
43582
522512
6134040
7760896
84152852
921897408
10112037852
11558049096
122713386758
1312907891432
1460190937724
15275575683576
161240483837374
175496780654912
1824002417723284
19103380586347376
20439565299059250
211846430027348704
227667597264015436

[1,8,72,528,3582,22512,134040,760896,4152852,
 21897408,112037852,558049096,2713386758,
 12907891432,60190937724,275575683576,
 1240483837374,5496780654912,24002417723284,
 103380586347376,439565299059250,1846430027348704,
 7667597264015436]