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A222770 as a simple table

n a(n)
1 0
2 3
3 4
4 11
5 18
6 73
7 152
8 470
9 1022
10 3361
11 7840
12 23386
13 57626
14 172387
15 434280
16 1257025
17 3275034
18 9399647
19 24776572
20 70325187
21 188540168
22 531573662
23 1436226680
24 4032772569
25 10987025446
26 30742228871
27 84180549328
28 235159618106

[0,3,4,11,18,73,152,470,1022,3361,7840,23386,
 57626,172387,434280,1257025,3275034,9399647,
 24776572,70325187,188540168,531573662,1436226680,
 4032772569,10987025446,30742228871,84180549328,
 235159618106]

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Last modified July 20 14:12 EDT 2019. Contains 325182 sequences. (Running on oeis4.)