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A000641 as a simple table

na(n)
00
11
22
35
414
539
6109
7312
8890
92552
107325
1121047
1260465
13173750
14499068
151433071
164113105
1711799780
1833834367
1996968462
20277771344
21795310628
222276055442
236510786627
2418616389094
2553207964655
26152014267327
27434136228215

[0,1,2,5,14,39,109,312,890,2552,7325,21047,60465,
 173750,499068,1433071,4113105,11799780,33834367,
 96968462,277771344,795310628,2276055442,
 6510786627,18616389094,53207964655,152014267327,
 434136228215]