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A007123 as a simple table

n a(n)
1 1
2 1
3 2
4 4
5 10
6 26
7 76
8 232
9 750
10 2494
11 8524
12 29624
13 104468
14 372308
15 1338936
16 4850640
17 17685270
18 64834550
19 238843660
20 883677784
21 3282152588
22 12233309868
23 45741634536
24 171530482864
25 644953425740
26 2430975800876

[1,1,2,4,10,26,76,232,750,2494,8524,29624,104468,
 372308,1338936,4850640,17685270,64834550,
 238843660,883677784,3282152588,12233309868,
 45741634536,171530482864,644953425740,
 2430975800876]

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Last modified January 16 21:37 EST 2019. Contains 319206 sequences. (Running on oeis4.)