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A049220 as a simple table

n a(n)
1 0
2 0
3 1
4 3
5 9
6 28
7 89
8 285
9 914
10 2931
11 9397
12 30124
13 96565
14 309545
15 992266
16 3180775
17 10196193
18 32684604
19 104772769
20 335856389
21 1076610978
22 3451151243
23 11062904925
24 35462909836
25 113678819677
26 364405349233
27 1168126647770

[0,0,1,3,9,28,89,285,914,2931,9397,30124,96565,
 309545,992266,3180775,10196193,32684604,104772769,
 335856389,1076610978,3451151243,11062904925,
 35462909836,113678819677,364405349233,
 1168126647770]

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Last modified September 25 19:18 EDT 2021. Contains 347659 sequences. (Running on oeis4.)