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A001925 as a simple table

na(n)
01
16
222
364
4162
5374
6809
71668
83316
96408
1012108
1122468
1241081
1374202
14132666
15235160
16413790
17723530
181258225
192177640
203753096
216444336
2211028792
2318818664
2432024977
2554367374
2692094334
27155688208
28262711866
29442556798
30744355673
311250157228

[1,6,22,64,162,374,809,1668,3316,6408,12108,22468,
 41081,74202,132666,235160,413790,723530,1258225,
 2177640,3753096,6444336,11028792,18818664,
 32024977,54367374,92094334,155688208,262711866,
 442556798,744355673,1250157228]