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A016981 as a simple table

na(n)
01
117
2207
32245
423231
5235677
62370967
723768645
8237928911
92380278637
1023806803527
11238084281045
122380908324991
1323809346902397
14238094528416887
152380949536089445
1623809512411623471
17238095192448290957

[1,17,207,2245,23231,235677,2370967,23768645,
 237928911,2380278637,23806803527,238084281045,
 2380908324991,23809346902397,238094528416887,
 2380949536089445,23809512411623471,
 238095192448290957]