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A309298 as a simple table

na(n)
00
10
20
31
42
57
620
749
8132
9330
10786
111892
124472
1310368
1423940
1554720
16123836
17278664
18622896
191383672
203058720
216729184
2214738688
2332157312
2469907200
25151461952
26327158208
27704648448
281513680192
293243601280
306934595840
3114793782400
3231496441856
3366929938944

[0,0,0,1,2,7,20,49,132,330,786,1892,4472,10368,
 23940,54720,123836,278664,622896,1383672,3058720,
 6729184,14738688,32157312,69907200,151461952,
 327158208,704648448,1513680192,3243601280,
 6934595840,14793782400,31496441856,66929938944]