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A027391 as a simple table

n a(n)
0 1
1 4
2 22
3 144
4 1074
5 8904
6 80676
7 789408
8 8267436
9 92024496
10 1082549736
11 13396319424
12 173709100152
13 2352429994464
14 33175988457264
15 486025859896704
16 7380209439505296
17 115932434008477248

[1,4,22,144,1074,8904,80676,789408,8267436,
 92024496,1082549736,13396319424,173709100152,
 2352429994464,33175988457264,486025859896704,
 7380209439505296,115932434008477248]

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Last modified April 24 07:54 EDT 2024. Contains 371922 sequences. (Running on oeis4.)