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A197894 as a simple table

na(n)
18
2186
33046
446988
5821491
613332946
7222339185
83713421692
961711530462
101027520573185
1117105147307563
12284817237813288
134741659653344637
1478929447412592761
151314011586007609149
1621875424220837153422

[8,186,3046,46988,821491,13332946,222339185,
 3713421692,61711530462,1027520573185,
 17105147307563,284817237813288,4741659653344637,
 78929447412592761,1314011586007609149,
 21875424220837153422]