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A234271 as a simple table

n a(n)
0 1
1 6
2 24
3 66
4 192
5 558
6 1608
7 4650
8 13440
9 38838
10 112248
11 324402
12 937536
13 2709534
14 7830696
15 22631130
16 65405184
17 189024486
18 546290904
19 1578810018
20 4562845632
21 13186868622
22 38110757640
23 110142133770
24 318316674432
25 919952263062
26 2658711384888
27 7683818510994
28 22206647643456
29 64178402815614

[1,6,24,66,192,558,1608,4650,13440,38838,112248,
 324402,937536,2709534,7830696,22631130,65405184,
 189024486,546290904,1578810018,4562845632,
 13186868622,38110757640,110142133770,318316674432,
 919952263062,2658711384888,7683818510994,
 22206647643456,64178402815614]

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Last modified February 16 21:59 EST 2019. Contains 320200 sequences. (Running on oeis4.)