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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”).

A237623 as a simple table

na(n)
10
20
30
40
50
61
72
86
914
1030
1162
12129
13252
14499
15984
161884
173624
187025
1913358
2025694
2149316

[0,0,0,0,0,1,2,6,14,30,62,129,252,499,984,1884,
 3624,7025,13358,25694,49316]