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A227937 as a simple table

na(n)
01
10
21
31
43
510
625
7105
8385
91540
107245
1132725
12164395
13870870
144689685
1527152125
16161786625
17997196200
186443061625
1942702885225
20292938721075
212078239413250
2215119319039825
23113390111659825
24873538909468225
256894294734827500
2655855506234653125
27463151808682688125
283927996120260086875
2934081631999814148750
30301951521812713898125
312731127272307562253125
3225208456056107710010625
33237164027532948085570000

[1,0,1,1,3,10,25,105,385,1540,7245,32725,164395,
 870870,4689685,27152125,161786625,997196200,
 6443061625,42702885225,292938721075,2078239413250,
 15119319039825,113390111659825,873538909468225,
 6894294734827500,55855506234653125,
 463151808682688125,3927996120260086875,
 34081631999814148750,301951521812713898125,
 2731127272307562253125,25208456056107710010625,
 237164027532948085570000]