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A181618 as a simple table

na(n)
10
20
36
424
590
6306
71008
83240
910266
1032190
11100188
12310074
13955500
142934288
158986086
1627456840
1783735370
18254962062
19775270908
202354646294
217144301016
2221657653028
2365603494458
24198584527338
25600758100540
261816426149876
275489387016378
2816582071393240

[0,0,6,24,90,306,1008,3240,10266,32190,100188,
 310074,955500,2934288,8986086,27456840,83735370,
 254962062,775270908,2354646294,7144301016,
 21657653028,65603494458,198584527338,600758100540,
 1816426149876,5489387016378,16582071393240]