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Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A264728 as a simple table

na(n)
11
21
31
41
52
61
71
84
93
101
112
1222
1348
1412
151
164
17154
18663
19474
2069
211
228
23931
2423096
2566528
2611552
27278
282
2916
3014160
311602048
3218761472
3312288000
34460672
352524
364
3748
38195952
39165778944

[1,1,1,1,2,1,1,4,3,1,2,22,48,12,1,4,154,663,474,
 69,1,8,931,23096,66528,11552,278,2,16,14160,
 1602048,18761472,12288000,460672,2524,4,48,195952,
 165778944]