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A138858 as a simple table

n a(n)
1 1
2 4
3 9
4 16
5 36
6 81
7 144
8 324
9 625
10 1156
11 2401
12 4900
13 9801
14 19600
15 39204
16 78400
17 156816
18 313600
19 627264
20 1254400
21 2509056
22 5022081
23 10042561
24 20088324
25 40182921
26 80371225
27 160731684
28 321484900
29 642977449
30 1285939600

[1,4,9,16,36,81,144,324,625,1156,2401,4900,9801,
 19600,39204,78400,156816,313600,627264,1254400,
 2509056,5022081,10042561,20088324,40182921,
 80371225,160731684,321484900,642977449,1285939600]

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Last modified November 17 00:08 EST 2019. Contains 329209 sequences. (Running on oeis4.)