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A215524 as a simple table

na(n)
01
11
24
312
452
5240
61188
76804
838960
9253296
101654560
1111816640
1285816608
13668005728
145240582592
1544667645120
16365989405440
173494595006720
1828075694694912
19325862541872640
202101211758356480
2139605981661066240
2248568198208302080
237549838510211486720
24-66667098077331572736

[1,1,4,12,52,240,1188,6804,38960,253296,1654560,
 11816640,85816608,668005728,5240582592,
 44667645120,365989405440,3494595006720,
 28075694694912,325862541872640,2101211758356480,
 39605981661066240,48568198208302080,
 7549838510211486720,-66667098077331572736]