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A116400 as a simple table

na(n)
00
10
21
31
45
55
621
721
884
984
10330
11330
121287
131287
145005
155005
1619448
1719448
1875582
1975582
20293930
21293930
221144066
231144066
244457400
254457400
2617383860
2717383860
2867863915
2967863915
30265182525

[0,0,1,1,5,5,21,21,84,84,330,330,1287,1287,5005,
 5005,19448,19448,75582,75582,293930,293930,
 1144066,1144066,4457400,4457400,17383860,17383860,
 67863915,67863915,265182525]