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A000635 as a simple table

na(n)
00
11
22
35
412
531
680
7210
8555
91479
103959
1110652
1228760
1377910
14211624
15576221
161572210
174297733
1811767328
1932266801
2088594626
21243544919
22670228623
231846283937
245090605118
2514047668068
2638794922293
27107215238057
28296501478704

[0,1,2,5,12,31,80,210,555,1479,3959,10652,28760,
 77910,211624,576221,1572210,4297733,11767328,
 32266801,88594626,243544919,670228623,1846283937,
 5090605118,14047668068,38794922293,107215238057,
 296501478704]