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A244900 as a simple table

n a(n)
1 4
2 22
3 118
4 646
5 3602
6 20358
7 116272
8 669516
9 3880216
10 22605350
11 132252980
12 776446672
13 4571648804
14 26982643512
15 156306697586
16 918491822736
17 5419056033902
18 32057939582902
19 190020627554666
20 1111060374626770

[4,22,118,646,3602,20358,116272,669516,3880216,
 22605350,132252980,776446672,4571648804,
 26982643512,156306697586,918491822736,
 5419056033902,32057939582902,190020627554666,
 1111060374626770]

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Last modified November 27 01:15 EST 2021. Contains 349344 sequences. (Running on oeis4.)