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A246317 as a simple table

n a(n)
0 1
1 4
2 12
3 40
4 176
5 724
6 3276
7 14620
8 61044
9 250396
10 1012804
11 4076236
12 16344284
13 65471860
14 262071708
15 1048641260 

[1,4,12,40,176,724,3276,14620,61044,250396,
 1012804,4076236,16344284,65471860,262071708,
 1048641260]

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Last modified April 25 07:07 EDT 2024. Contains 371964 sequences. (Running on oeis4.)