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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”).

A048897 as a simple table

na(n)
11
25
31
445
515
61
7585
8255
930
101
119945
125175
13825
1450
151
16208845
17123795
1824150

[1,5,1,45,15,1,585,255,30,1,9945,5175,825,50,1,
 208845,123795,24150]