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A045889 as a simple table

n a(n)
0 1
1 7
2 30
3 102
4 303
5 825
6 2116
7 5200
8 12381
9 28779
10 65658
11 147594
12 327835
13 721069
14 1573056
15 3408084
16 7340265
17 15728895
18 33554710
19 71303470
20 150995271
21 318767457
22 671089020
23 1409286552
24 2952790453
25 6174015955
26 12884902386

[1,7,30,102,303,825,2116,5200,12381,28779,65658,
 147594,327835,721069,1573056,3408084,7340265,
 15728895,33554710,71303470,150995271,318767457,
 671089020,1409286552,2952790453,6174015955,
 12884902386]

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Last modified August 8 11:31 EDT 2020. Contains 336298 sequences. (Running on oeis4.)