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A045907 as a simple table

n a(n)
0 0
1 1
2 1
3 4
4 6
5 15
6 25
7 57
8 103
9 223
10 417
11 898
12 1722
13 3707
14 7211
15 15620
16 30724
17 66939
18 132729
19 290916
20 580680
21 1279281
22 2567397
23 5682009
24 11456481
25 25454265
26 51528969
27 114880470
28 233380592
29 521860455
30 1063460261
31 2384247105

[0,1,1,4,6,15,25,57,103,223,417,898,1722,3707,
 7211,15620,30724,66939,132729,290916,580680,
 1279281,2567397,5682009,11456481,25454265,
 51528969,114880470,233380592,521860455,1063460261,
 2384247105]

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Last modified December 5 00:21 EST 2021. Contains 349530 sequences. (Running on oeis4.)