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A026987 as a simple table

n a(n)
1 1
2 6
3 35
4 154
5 613
6 2882
7 14995
8 68730
9 291606
10 1378110
11 7047087
12 32801046
13 143237183
14 681449778
15 3462931356
16 16261134650
17 72210836920
18 345094694354
19 1747534150303
20 8253521588404
21 37063741964059
22 177681801860358
23 897584067273979
24 4256535683245074
25 19269823577105032

[1,6,35,154,613,2882,14995,68730,291606,1378110,
 7047087,32801046,143237183,681449778,3462931356,
 16261134650,72210836920,345094694354,
 1747534150303,8253521588404,37063741964059,
 177681801860358,897584067273979,4256535683245074,
 19269823577105032]

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Last modified January 30 19:10 EST 2023. Contains 359947 sequences. (Running on oeis4.)