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A215864 as a simple table

n a(n)
0 0
1 137
2 1267
3 6412
4 23597
5 70707
6 183099
7 424809
8 904299
9 1795794
10 3367364
11 6017011
12 10318126
13 17075786
14 27395466
15 42765846
16 65157498
17 97139343
18 142014873
19 203980238
20 288306403
21 401547685
22 551779085
23 748864935
24 1004761485
25 1333856160
26 1753346322
27 2283660477

[0,137,1267,6412,23597,70707,183099,424809,904299,
 1795794,3367364,6017011,10318126,17075786,
 27395466,42765846,65157498,97139343,142014873,
 203980238,288306403,401547685,551779085,748864935,
 1004761485,1333856160,1753346322,2283660477]

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Last modified June 2 15:41 EDT 2020. Contains 334787 sequences. (Running on oeis4.)