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A220436 as a simple table

n a(n)
0 4
1 36
2 196
3 1444
4 9604
5 66564
6 454276
7 3118756
8 21362884
9 146458404
10 1003749124
11 6880038916
12 47155859716
13 323212716324
14 2215328606404
15 15184099435684
16 104073336269956
17 713329336067076
18 4889231802533764
19 33511293841053604
20 229689823620354244
21 1574317475335503396
22 10790532493690424836

[4,36,196,1444,9604,66564,454276,3118756,21362884,
 146458404,1003749124,6880038916,47155859716,
 323212716324,2215328606404,15184099435684,
 104073336269956,713329336067076,4889231802533764,
 33511293841053604,229689823620354244,
 1574317475335503396,10790532493690424836]

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Last modified February 16 21:37 EST 2020. Contains 331975 sequences. (Running on oeis4.)