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A098620 as a simple table

n a(n)
0 1
1 1
2 4
3 26
4 257
5 3586
6 66207
7 1540693
8 43659615
9 1469677309
10 57681784820
11 2601121752854
12 133170904684965
13 7664254746784243
14 491679121677763607
15 34905596059311761907
16 2725010800987216480527
17 232643959843709167832482
18 21613761720729431904201734

[1,1,4,26,257,3586,66207,1540693,43659615,
 1469677309,57681784820,2601121752854,
 133170904684965,7664254746784243,
 491679121677763607,34905596059311761907,
 2725010800987216480527,232643959843709167832482,
 21613761720729431904201734]

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Last modified May 15 17:50 EDT 2021. Contains 343920 sequences. (Running on oeis4.)