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A204089 as a simple table

na(n)
01
11
24
314
448
5164
6560
71912
86528
922288
1076096
11259808
12887040
133028544
1410340096
1535303296
16120532992
17411525376
181405035520
194797091328
2016378294272
2155918994432
22190919389184
23651839567872
242225519493120
257598398836736
2625942556360704
2788573427769344

[1,1,4,14,48,164,560,1912,6528,22288,76096,259808,
 887040,3028544,10340096,35303296,120532992,
 411525376,1405035520,4797091328,16378294272,
 55918994432,190919389184,651839567872,
 2225519493120,7598398836736,25942556360704,
 88573427769344]