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A099014 as a simple table

na(n)
00
11
25
320
487
5365
61552
76565
827825
9117844
10499235
112114729
128958240
1337947545
14160748653
15680941780
162884516383
1712219006325
1851760543280
19219261176861
20928805254905
213934482189716
2216666734024715
2370601418270865

[0,1,5,20,87,365,1552,6565,27825,117844,499235,
 2114729,8958240,37947545,160748653,680941780,
 2884516383,12219006325,51760543280,219261176861,
 928805254905,3934482189716,16666734024715,
 70601418270865]