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A047664 as a simple table

na(n)
17
256
3287
41120
53591
69912
724319
854272
9112071
10216952
11397727
12696032
131170247
141900152
152992383
164586752
176863495
1810051512
1914437663
2020377184
2128305287
2238750008
2352346367
2469851904
2592163655
26120336632
27155603871

[7,56,287,1120,3591,9912,24319,54272,112071,
 216952,397727,696032,1170247,1900152,2992383,
 4586752,6863495,10051512,14437663,20377184,
 28305287,38750008,52346367,69851904,92163655,
 120336632,155603871]