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A271939 as a simple table

na(n)
18
288
3776
46424
552040
6418264
73351944
826833048
9214716872
101717892440
1113743611912
12109950312472
13879606751304
147036866765016
1556294972383880
16450359893862296
173602879495272136
1828823036995298392
19230584299061751048
201844674401792100120

[8,88,776,6424,52040,418264,3351944,26833048,
 214716872,1717892440,13743611912,109950312472,
 879606751304,7036866765016,56294972383880,
 450359893862296,3602879495272136,
 28823036995298392,230584299061751048,
 1844674401792100120]