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A326008 as a simple table

n a(n)
0 1
1 4
2 14
3 40
4 155
5 596
6 2954
7 14784
8 83955
9 494060
10 3112246
11 20505484
12 141656697
13 1020670280
14 7650120170
15 59509447736
16 479350116043
17 3990968968884
18 34287091686110
19 303500118414180
20 2764254404207136
21 25873492982703592
22 248602031383697602
23 2449525056696683760
24 24727324378709830225
25 255512480002690958696
26 2700450457984818382502
27 29169124796849950540212
28 321787888546754475501470
29 3623188502069809345093500

[1,4,14,40,155,596,2954,14784,83955,494060,
 3112246,20505484,141656697,1020670280,7650120170,
 59509447736,479350116043,3990968968884,
 34287091686110,303500118414180,2764254404207136,
 25873492982703592,248602031383697602,
 2449525056696683760,24727324378709830225,
 255512480002690958696,2700450457984818382502,
 29169124796849950540212,321787888546754475501470,
 3623188502069809345093500]

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Last modified December 11 21:15 EST 2019. Contains 329937 sequences. (Running on oeis4.)