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A181927 as a simple table

n a(n)
0 1
1 2
2 3
3 10
4 56
5 502
6 6930
7 157172
8 5847270
9 350430420
10 33789991248
11 5280020814732
12 1338210835193414
13 548265785425359340
14 363248986031094300018
15 389399454403643525265020
16 675824289510077938157099920

[1,2,3,10,56,502,6930,157172,5847270,350430420,
 33789991248,5280020814732,1338210835193414,
 548265785425359340,363248986031094300018,
 389399454403643525265020,
 675824289510077938157099920]

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Last modified April 9 04:05 EDT 2020. Contains 333343 sequences. (Running on oeis4.)