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A218843 as a simple table

na(n)
11
27
320
457
5156
6438
71220
83398
99468
1026380
1173496
12204780
13570556
141589672
154429140
1612340436
1734382820
1895797176
19266909376
20743660900
212071982512
225772942284
2316084528900
2444814595084
25124862092120
26347889834096

[1,7,20,57,156,438,1220,3398,9468,26380,73496,
 204780,570556,1589672,4429140,12340436,34382820,
 95797176,266909376,743660900,2071982512,
 5772942284,16084528900,44814595084,124862092120,
 347889834096]