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A087222 as a simple table

n a(n)
0 1
1 1
2 4
3 10
4 26
5 69
6 184
7 488
8 1294
9 3436
10 9116
11 24190
12 64190
13 170334
14 451994
15 1199400
16 3182706
17 8445556
18 22410946
19 59469200
20 157806184
21 418751069
22 1111188772
23 2948626472
24 7824411358
25 20762688580
26 55095420880
27 146200015984

[1,1,4,10,26,69,184,488,1294,3436,9116,24190,
 64190,170334,451994,1199400,3182706,8445556,
 22410946,59469200,157806184,418751069,1111188772,
 2948626472,7824411358,20762688580,55095420880,
 146200015984]

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Last modified November 28 16:34 EST 2021. Contains 349413 sequences. (Running on oeis4.)