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A267784 as a simple table

n a(n)
1 15
2 225
3 1056
4 5081
5 14956
6 44742
7 102954
8 238813
9 472174
10 935890
11 1669256
12 2973801
13 4921484
14 8116406
15 12686802
16 19733869
17 29485150
18 43804354
19 63094592
20 90326137
21 126206748
22 175240166
23 238647082
24 322974141
25 430276638
26 569730226

[15,225,1056,5081,14956,44742,102954,238813,
 472174,935890,1669256,2973801,4921484,8116406,
 12686802,19733869,29485150,43804354,63094592,
 90326137,126206748,175240166,238647082,322974141,
 430276638,569730226]

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Last modified October 15 20:06 EDT 2021. Contains 348034 sequences. (Running on oeis4.)