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A218722 as a simple table

na(n)
00
11
220
3381
47240
5137561
62613660
749659541
8943531280
917927094321
10340614792100
116471681049901
12122961939948120
132336276859014281
1444389260321271340
15843395946104155461
1616024522975978953760
17304465936543600121441

[0,1,20,381,7240,137561,2613660,49659541,
 943531280,17927094321,340614792100,6471681049901,
 122961939948120,2336276859014281,
 44389260321271340,843395946104155461,
 16024522975978953760,304465936543600121441]