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A004254 as a simple table

na(n)
00
11
25
324
4115
5551
62640
712649
860605
9290376
101391275
116665999
1231938720
13153027601
14733199285
153512968824
1616831644835
1780645255351
18386394631920
191851327904249
208870244889325
2142499896542376
22203629237822555
23975646292570399
244674602225029440

[0,1,5,24,115,551,2640,12649,60605,290376,1391275,
 6665999,31938720,153027601,733199285,3512968824,
 16831644835,80645255351,386394631920,
 1851327904249,8870244889325,42499896542376,
 203629237822555,975646292570399,4674602225029440]