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A090681 as a simple table

n a(n)
0 1
1 1
2 31
3 5461
4 3202291
5 4722116521
6 14717667114151
7 86125672563201181
8 868320396104950823611
9 14129659550745551130667441
10 352552873457246307069012458671
11 12942188000689093683411117827763301
12 675618013651758631167025175564066787331
13 48743995308245045290420262686473639399176761

[1,1,31,5461,3202291,4722116521,14717667114151,
 86125672563201181,868320396104950823611,
 14129659550745551130667441,
 352552873457246307069012458671,
 12942188000689093683411117827763301,
 675618013651758631167025175564066787331,
 48743995308245045290420262686473639399176761]

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Last modified October 16 08:50 EDT 2019. Contains 328056 sequences. (Running on oeis4.)