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A198855 as a simple table

na(n)
06
155
2447
33583
428671
5229375
61835007
714680063
8117440511
9939524095
107516192767
1160129542143
12481036337151
133848290697215
1430786325577727
15246290604621823
161970324836974591
1715762598695796735
18126100789566373887

[6,55,447,3583,28671,229375,1835007,14680063,
 117440511,939524095,7516192767,60129542143,
 481036337151,3848290697215,30786325577727,
 246290604621823,1970324836974591,
 15762598695796735,126100789566373887]