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A270669 as a simple table

n a(n)
0 1
1 1
2 4
3 31
4 168
5 1841
6 19320
7 226885
8 2655408
9 47569681
10 743996880
11 12582916061
12 245804712120
13 4831304993113
14 109782586920552
15 2669560767444901
16 61579705719702240
17 1566459883903878305
18 44585240861695115808
19 1212424119941953292461
20 37517727808419084095400

[1,1,4,31,168,1841,19320,226885,2655408,47569681,
 743996880,12582916061,245804712120,4831304993113,
 109782586920552,2669560767444901,
 61579705719702240,1566459883903878305,
 44585240861695115808,1212424119941953292461,
 37517727808419084095400]

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Last modified August 31 08:34 EDT 2024. Contains 375560 sequences. (Running on oeis4.)