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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”).

A051738 as a simple table

na(n)
11
25
330
4180
51075
66366
737520
8220500
91293615
107581240
1144398387
12259881960
131520633270
148895116230

[1,5,30,180,1075,6366,37520,220500,1293615,
 7581240,44398387,259881960,1520633270,8895116230]