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A269580 as a simple table

na(n)
16
236
3216
41276
57456
643184
7248324
81419502
98074172
1045734140
11258127540
121452448400
138151217700
1445640705908
15255046211478
161422758512212
177924694792032
1844081166810484
19244913122501544
201359313355233592

[6,36,216,1276,7456,43184,248324,1419502,8074172,
 45734140,258127540,1452448400,8151217700,
 45640705908,255046211478,1422758512212,
 7924694792032,44081166810484,244913122501544,
 1359313355233592]