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A185308 as a simple table

n a(n)
0 0
1 0
2 1
3 2
4 7
5 18
6 61
7 188
8 677
9 2370
10 9141
11 35212
12 144905
13 602662
14 2631333
15 11671264
16 53772593
17 252184082
18 1220090757
19 6011588316
20 30413403457
21 156656758094
22 825751634149
23 4428857070312
24 24246896289889
25 134968323047690
26 765387626584805
27 4409532348872436

[0,0,1,2,7,18,61,188,677,2370,9141,35212,144905,
 602662,2631333,11671264,53772593,252184082,
 1220090757,6011588316,30413403457,156656758094,
 825751634149,4428857070312,24246896289889,
 134968323047690,765387626584805,4409532348872436]

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Last modified June 16 08:46 EDT 2021. Contains 345056 sequences. (Running on oeis4.)