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A298987 as a simple table

na(n)
01
11
24
327
480
5400
61908
76223
831296
9116478
10450100
111828915
127360848
1326906828
1495776772
15403908975
161421758720
175072014447
1818481180644
1968350964211
20246180936400
21827642046294
222958748580084
2310294629775620
2436607347335232
25120800714172500
26407951731319860
271405943613730899

[1,1,4,27,80,400,1908,6223,31296,116478,450100,
 1828915,7360848,26906828,95776772,403908975,
 1421758720,5072014447,18481180644,68350964211,
 246180936400,827642046294,2958748580084,
 10294629775620,36607347335232,120800714172500,
 407951731319860,1405943613730899]