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A252825 as a simple table

n a(n)
1 15
2 142
3 1238
4 9075
5 54376
6 271846
7 1165921
8 4396009
9 14863460
10 45791493
11 130210765
12 345350438
13 861722537
14 2037396931
15 4591832266
16 9915068062
17 20600380173
18 41336047432
19 80360448168
20 151781791285
21 279198974102

[15,142,1238,9075,54376,271846,1165921,4396009,
 14863460,45791493,130210765,345350438,861722537,
 2037396931,4591832266,9915068062,20600380173,
 41336047432,80360448168,151781791285,279198974102]

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Last modified January 17 20:06 EST 2022. Contains 350410 sequences. (Running on oeis4.)