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A057974 as a simple table

na(n)
04
18
286
3148
4540
51574
66344
714406
863836
924317046
101723718810
114303212632
1259865566356
1378575930302

[4,8,86,148,540,1574,6344,14406,63836,24317046,
 1723718810,4303212632,59865566356,78575930302]