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A295933 as a simple table

na(n)
18
220
355
4160
5475
61420
74255
812760
938275
10114820
11344455
121033360
133100075
149300220
1527900655
1683701960
17251105875
18753317620
192259952855
206779858560
2120339575675
2261018727020
23183056181055
24549168543160
251647505629475
264942516888420
2714827550665255

[8,20,55,160,475,1420,4255,12760,38275,114820,
 344455,1033360,3100075,9300220,27900655,83701960,
 251105875,753317620,2259952855,6779858560,
 20339575675,61018727020,183056181055,549168543160,
 1647505629475,4942516888420,14827550665255]