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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”).

A207411 as a simple table

na(n)
10
20
30
40
50
61
75
838
9330
103435
1141823
12614757
1310678281
14218040550
155180904503

[0,0,0,0,0,1,5,38,330,3435,41823,614757,10678281,
 218040550,5180904503]