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A089893 as a simple table

n a(n)
0 0
1 1
2 4
3 21
4 64
5 321
6 1092
7 5461
8 16384
9 81921
10 278532
11 1392661
12 4210752
13 21053761
14 71582788
15 357913941
16 1073741824
17 5368709121
18 18253611012
19 91268055061
20 275951648832
21 1379758244161
22 4691178030148
23 23455890150741

[0,1,4,21,64,321,1092,5461,16384,81921,278532,
 1392661,4210752,21053761,71582788,357913941,
 1073741824,5368709121,18253611012,91268055061,
 275951648832,1379758244161,4691178030148,
 23455890150741]

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Last modified November 25 16:38 EST 2014. Contains 249998 sequences.