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A018217 as a simple table

n a(n)
0 0
1 4
2 36
3 232
4 1300
5 6744
6 33320
7 159184
8 742068
9 3395320
10 15308920
11 68213424
12 300999816
13 1317415792
14 5726300880
15 24742452128
16 106357582324
17 455122855224
18 1939780103768
19 8238185701360
20 34876073003352
21 147223869286736
22 619871651308336
23 2603757232133472
24 10913483674589000

[0,4,36,232,1300,6744,33320,159184,742068,3395320,
 15308920,68213424,300999816,1317415792,5726300880,
 24742452128,106357582324,455122855224,
 1939780103768,8238185701360,34876073003352,
 147223869286736,619871651308336,2603757232133472,
 10913483674589000]

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Last modified April 25 06:14 EDT 2024. Contains 371964 sequences. (Running on oeis4.)