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Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A235957 as a simple table

na(n)
1144
2928
35196
427296
5137988
6681546
73311312
815908352
975789960
10358924192
111692140136
127951451162
1337271897084
14174391909248
15814845026092
163803491428248
1717740156559908
1882696152825954
19385325015689600

[144,928,5196,27296,137988,681546,3311312,
 15908352,75789960,358924192,1692140136,7951451162,
 37271897084,174391909248,814845026092,
 3803491428248,17740156559908,82696152825954,
 385325015689600]