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A140088 as a simple table

na(n)
00
10
20
31
46
524
678
7368
81902
911062
1077426
11692414
126261624
1368889928
14764874856
159274470290

[0,0,0,1,6,24,78,368,1902,11062,77426,692414,
 6261624,68889928,764874856,9274470290]