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A248836 as a simple table

na(n)
12
26
322
496
5482
62736
717302
8120576
9917762
107574016
1167354582
12642041856
136530291042
1470589700096
15808090395862
169766250151936
17124258689304322
181660195646078976
1923239748527125142
20340125128186658816

[2,6,22,96,482,2736,17302,120576,917762,7574016,
 67354582,642041856,6530291042,70589700096,
 808090395862,9766250151936,124258689304322,
 1660195646078976,23239748527125142,
 340125128186658816]