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A128104 as a simple table

n a(n)
1 2
2 6
3 18
4 52
5 145
6 402
7 1092
8 2976
9 8100
10 22020
11 59873
12 162744
13 442403
14 1202600
15 3269010
16 8886096
17 24154943
18 65659968
19 178482295
20 485165180
21 1318815729
22 3584912826
23 9744803438
24 26489122128
25 72004899325
26 195729609426

[2,6,18,52,145,402,1092,2976,8100,22020,59873,
 162744,442403,1202600,3269010,8886096,24154943,
 65659968,178482295,485165180,1318815729,
 3584912826,9744803438,26489122128,72004899325,
 195729609426]

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Last modified August 13 22:57 EDT 2020. Contains 336473 sequences. (Running on oeis4.)