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A240380 as a simple table

na(n)
18
2366
312234
4279886
58802558
6207932244
76169009514
8148090588518
94275011910288
10104011573900208
112947730099151186
1272619839200406266
132029464330510629772
1450540971131672863686
151396965866163201451210

[8,366,12234,279886,8802558,207932244,6169009514,
 148090588518,4275011910288,104011573900208,
 2947730099151186,72619839200406266,
 2029464330510629772,50540971131672863686,
 1396965866163201451210]