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A001091 as a simple table

n a(n)
0 1
1 4
2 31
3 244
4 1921
5 15124
6 119071
7 937444
8 7380481
9 58106404
10 457470751
11 3601659604
12 28355806081
13 223244789044
14 1757602506271
15 13837575261124
16 108942999582721
17 857706421400644
18 6752708371622431
19 53163960551578804

[1,4,31,244,1921,15124,119071,937444,7380481,
 58106404,457470751,3601659604,28355806081,
 223244789044,1757602506271,13837575261124,
 108942999582721,857706421400644,6752708371622431,
 53163960551578804]

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Last modified November 17 05:27 EST 2019. Contains 329217 sequences. (Running on oeis4.)