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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”).

A194023 as a simple table

na(n)
10
20
30
40
50
649
710010
8413727
98363578
10108576799
111030757941
127721414278
1347957203600
14255640086696
151199509369309
165050244459572
1719366840027021
1868459296434321
19225242952960337
20695338409837163
212027581798386055

[0,0,0,0,0,49,10010,413727,8363578,108576799,
 1030757941,7721414278,47957203600,255640086696,
 1199509369309,5050244459572,19366840027021,
 68459296434321,225242952960337,695338409837163,
 2027581798386055]