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A144656 as a simple table

n a(n)
0 0
1 1
2 0
3 1
4 4
5 49
6 900
7 24649
8 944784
9 48455521
10 3210355600
11 267186643801
12 27307626948900
13 3363915436531441
14 491705171699154084
15 84158959760104032049
16 16675767262618669710400
17 3787671541267275818341249
18 977702867682508392324162624
19 284628954669920840314598014801

[0,1,0,1,4,49,900,24649,944784,48455521,
 3210355600,267186643801,27307626948900,
 3363915436531441,491705171699154084,
 84158959760104032049,16675767262618669710400,
 3787671541267275818341249,
 977702867682508392324162624,
 284628954669920840314598014801]

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Last modified April 3 01:23 EDT 2020. Contains 333195 sequences. (Running on oeis4.)