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A316951 as a simple table

na(n)
15
21493
371505
44335826
5259163370
615440641209
7920789559090
854906173292280
93273992108473660
10195225156534000032
1111641092125426590175
12694147342926715857535
1341391351968297005683248
142468127308681014210659067

[5,1493,71505,4335826,259163370,15440641209,
 920789559090,54906173292280,3273992108473660,
 195225156534000032,11641092125426590175,
 694147342926715857535,41391351968297005683248,
 2468127308681014210659067]