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A098531 as a simple table

n a(n)
0 0
1 1
2 2
3 34
4 277
5 3402
6 36170
7 407463
8 4491564
9 49926988
10 553211363
11 6137270812
12 68054635036
13 754774491429
14 8370420537086
15 92830050637086
16 1029498223070793
17 11417322172518550
18 126619992693837974
19 1404237451180502875
20 15573231068749231000

[0,1,2,34,277,3402,36170,407463,4491564,49926988,
 553211363,6137270812,68054635036,754774491429,
 8370420537086,92830050637086,1029498223070793,
 11417322172518550,126619992693837974,
 1404237451180502875,15573231068749231000]

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Last modified November 22 00:32 EST 2019. Contains 329383 sequences. (Running on oeis4.)