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A274957 as a simple table

na(n)
124
2648
36936
487780
51119744
614362920
7183551766
82348053596
930087735576
10385522530402
114938288770400
1263258857161326
13810399782288934
1410381856146131732
15132997595413557654
161703779141582413888

[24,648,6936,87780,1119744,14362920,183551766,
 2348053596,30087735576,385522530402,4938288770400,
 63258857161326,810399782288934,10381856146131732,
 132997595413557654,1703779141582413888]