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A331951 as a simple table

na(n)
00
10
20
31
42
56
620
769
8246
9894
103292
1112242
1245868
13172884
14654792
152489981
169500774
1736356214
18139471404
19536217814
202065543012
217970227084
2230801517624
23119198827218
24461863265660
251791626278060
266957151415832
2727041349974436
28105197526148312
29409575623758440
301595836895778320

[0,0,0,1,2,6,20,69,246,894,3292,12242,45868,
 172884,654792,2489981,9500774,36356214,139471404,
 536217814,2065543012,7970227084,30801517624,
 119198827218,461863265660,1791626278060,
 6957151415832,27041349974436,105197526148312,
 409575623758440,1595836895778320]