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A318387 as a simple table

na(n)
16
28
315
426
569
6134
7393
81556
94659
109314
1127933
12921327
1385680249
14171360494
152227686253
1617821489976
17124750429783
1819336316610785
194544034403522255
203567067006764843005
21203322819385596050031
2225008706784428314148401
23825287323886134366896771
2491606892951360914725537141
251923744751978579209236279751

[6,8,15,26,69,134,393,1556,4659,9314,27933,921327,
 85680249,171360494,2227686253,17821489976,
 124750429783,19336316610785,4544034403522255,
 3567067006764843005,203322819385596050031,
 25008706784428314148401,825287323886134366896771,
 91606892951360914725537141,
 1923744751978579209236279751]