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A147690 as a simple table

n a(n)
0 1
1 4
2 15
3 80
4 648
5 8437
6 177198
7 6024766
8 331362185
9 29491234554
10 4246737775920
11 989489901789593
12 373037692974676938
13 227552992714552932790
14 224594803809263744664717
15 358677901683394200229554646
16 926823697949890613393169207848

[1,4,15,80,648,8437,177198,6024766,331362185,
 29491234554,4246737775920,989489901789593,
 373037692974676938,227552992714552932790,
 224594803809263744664717,
 358677901683394200229554646,
 926823697949890613393169207848]

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Last modified May 14 16:45 EDT 2024. Contains 372533 sequences. (Running on oeis4.)