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A081553 as a simple table

n a(n)
1 1
2 21
3 303
4 4006
5 50010
6 600015
7 7000021
8 80000028
9 900000036
10 1000000045
11 10000000055
12 100000000066

[1,21,303,4006,50010,600015,7000021,80000028,
 900000036,1000000045,10000000055,100000000066]

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Last modified September 19 23:31 EDT 2019. Contains 327207 sequences. (Running on oeis4.)