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A278398 as a simple table

na(n)
01
13
215
375
4400
52169
611989
766985
8377718
92144290
1012240943
1170193305
12404029950
132332989921
1413508237399
1578399357623
16455959701700
172656652705422
1815504203678738
1990614205677898
20530288460288008
213107012752773125
2218223934202102463
23106996319699099591

[1,3,15,75,400,2169,11989,66985,377718,2144290,
 12240943,70193305,404029950,2332989921,
 13508237399,78399357623,455959701700,
 2656652705422,15504203678738,90614205677898,
 530288460288008,3107012752773125,
 18223934202102463,106996319699099591]