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A000704 as a simple table

na(n)
01
11
21
31
44
516
646
7106
8316
91324
105356
1118316
1263856
13272416
141264264
155409496
1622302736
17101343376
18507711376
192495918224
2011798364736
2158074029056
22309240315616
231670570920096
248792390355904
2546886941456576
26264381946998976
271533013006902976

[1,1,1,1,4,16,46,106,316,1324,5356,18316,63856,
 272416,1264264,5409496,22302736,101343376,
 507711376,2495918224,11798364736,58074029056,
 309240315616,1670570920096,8792390355904,
 46886941456576,264381946998976,1533013006902976]