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A207875 as a simple table

na(n)
19
281
3164
4400
5824
61940
74200
89276
921004
1046026
11102674
12228630
13506868
141128070
152505156
165569740
1712380188
1827502690
1961145106
20135886522
21301975112
22671190932
231491685306
243315241202
257368059728
2616375432824
2736394465410

[9,81,164,400,824,1940,4200,9276,21004,46026,
 102674,228630,506868,1128070,2505156,5569740,
 12380188,27502690,61145106,135886522,301975112,
 671190932,1491685306,3315241202,7368059728,
 16375432824,36394465410]