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A316878 as a simple table

na(n)
14
214
337
4105
5388
61280
74121
813933
946641
10154593
11516270
121725502
135753200
1419197252
1564095188
16213911810
17713904833
182382943651
197953695202
2026546786860
2188606850547
22295748963969
23987132925969
243294803783913
2510997255560702

[4,14,37,105,388,1280,4121,13933,46641,154593,
 516270,1725502,5753200,19197252,64095188,
 213911810,713904833,2382943651,7953695202,
 26546786860,88606850547,295748963969,987132925969,
 3294803783913,10997255560702]