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A247821 as a simple table

na(n)
12
21334
31969
428669
586006
6126961
7338603654
8536801281
9366479720500691270
10375344017599431990
11500461553802019261
12554079264075351985

[2,1334,1969,28669,86006,126961,338603654,
 536801281,366479720500691270,375344017599431990,
 500461553802019261,554079264075351985]