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A027853 as a simple table

na(n)
00
11
24
315
452
5175
6571
71838
85834
918363
1057372
11178271
12551344
131698782
145217266
1515979465
1648825416
17148877730
18453124341
191376890744
204177819301
2112659943750
2238317731349
23115851225052
24349924919167

[0,1,4,15,52,175,571,1838,5834,18363,57372,178271,
 551344,1698782,5217266,15979465,48825416,
 148877730,453124341,1376890744,4177819301,
 12659943750,38317731349,115851225052,349924919167]