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A001874 as a simple table

na(n)
01
16
227
398
4315
5924
62534
76588
816407
939430
1091959
11209034
12464723
131013292
142171850
154584620
169546570
1719635840
1839940460
1980421600
20160437690
21317354740
22622844730
231213580820
242348773525
254517541378
268638447293
2716428864606
2831086197469
2958539877020

[1,6,27,98,315,924,2534,6588,16407,39430,91959,
 209034,464723,1013292,2171850,4584620,9546570,
 19635840,39940460,80421600,160437690,317354740,
 622844730,1213580820,2348773525,4517541378,
 8638447293,16428864606,31086197469,58539877020]