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A001656 as a simple table

na(n)
01
15
240
3260
41820
512376
685085
7582505
83994320
927372840
10187628376
111285992240
128814405145
1360414613805
14414088493560
152838203264876
1619453338487220
17133335155341960
18913892777190965
196263914210945105

[1,5,40,260,1820,12376,85085,582505,3994320,
 27372840,187628376,1285992240,8814405145,
 60414613805,414088493560,2838203264876,
 19453338487220,133335155341960,913892777190965,
 6263914210945105]