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A290905 as a simple table

n a(n)
0 0
1 1
2 4
3 12
4 36
5 111
6 344
7 1064
8 3288
9 10161
10 31404
11 97060
12 299980
13 927135
14 2865456
15 8856144
16 27371312
17 84595361
18 261455316
19 808068924
20 2497464564
21 7718808463
22 23856195976
23 73731339384
24 227878342920
25 704293989585
26 2176731748220
27 6727533066836
28 20792502889884

[0,1,4,12,36,111,344,1064,3288,10161,31404,97060,
 299980,927135,2865456,8856144,27371312,84595361,
 261455316,808068924,2497464564,7718808463,
 23856195976,73731339384,227878342920,704293989585,
 2176731748220,6727533066836,20792502889884]

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Last modified June 2 11:11 EDT 2024. Contains 373040 sequences. (Running on oeis4.)