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A290922 as a simple table

na(n)
01
15
220
375
4279
51040
63881
714485
854060
9201755
10752959
112810080
1210487361
1339139365
14146070100
15545141035
162034494039
177592835120
1828336846441
19105754550645
20394681356140
211472970873915
225497202139519
2320515837684160
2476566148597121
25285748756704325

[1,5,20,75,279,1040,3881,14485,54060,201755,
 752959,2810080,10487361,39139365,146070100,
 545141035,2034494039,7592835120,28336846441,
 105754550645,394681356140,1472970873915,
 5497202139519,20515837684160,76566148597121,
 285748756704325]