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A220387 as a simple table

n a(n)
1 1
2 7
3 25
4 79
5 278
6 966
7 3362
8 11642
9 40375
10 140102
11 486191
12 1686966
13 5853300
14 20309556
15 70470311
16 244518242
17 848429087
18 2943877082
19 10214660764
20 35442822154
21 122979474647
22 426714063696
23 1480612045993
24 5137426278616

[1,7,25,79,278,966,3362,11642,40375,140102,486191,
 1686966,5853300,20309556,70470311,244518242,
 848429087,2943877082,10214660764,35442822154,
 122979474647,426714063696,1480612045993,
 5137426278616]

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Last modified February 4 22:05 EST 2023. Contains 360082 sequences. (Running on oeis4.)