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A004253 as a simple table

n a(n)
1 1
2 4
3 19
4 91
5 436
6 2089
7 10009
8 47956
9 229771
10 1100899
11 5274724
12 25272721
13 121088881
14 580171684
15 2779769539
16 13318676011
17 63813610516
18 305749376569
19 1464933272329
20 7018916985076
21 33629651653051
22 161129341280179

[1,4,19,91,436,2089,10009,47956,229771,1100899,
 5274724,25272721,121088881,580171684,2779769539,
 13318676011,63813610516,305749376569,
 1464933272329,7018916985076,33629651653051,
 161129341280179]

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Last modified February 24 14:41 EST 2018. Contains 299623 sequences. (Running on oeis4.)