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A018907 as a simple table

na(n)
02
17
225
390
4325
51174
64241
715321
855349
9199956
10722370
112609667
129427803
1334059315
14123044249
15444515318
161605876501
175801463374
1820958633656
1975716124779
20273535557978
21988187148996
223569970385786
2312897039359739
2446592438107869
25168321986797406

[2,7,25,90,325,1174,4241,15321,55349,199956,
 722370,2609667,9427803,34059315,123044249,
 444515318,1605876501,5801463374,20958633656,
 75716124779,273535557978,988187148996,
 3569970385786,12897039359739,46592438107869,
 168321986797406]