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A251787 as a simple table

na(n)
16144
214908
344504
4149364
5541656
61765074
76446816
824880436
990369250
10354040208
111437800720
125668460910
1323255195002
1497097665658
15400041205158
161677704911872
177090646094602
1829794962043796
19126115432891882

[6144,14908,44504,149364,541656,1765074,6446816,
 24880436,90369250,354040208,1437800720,5668460910,
 23255195002,97097665658,400041205158,
 1677704911872,7090646094602,29794962043796,
 126115432891882]