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A157840 as a simple table

n a(n)
1 2649601
2 139478401
3 483667201
4 1035216001
5 1794124801
6 2760393601
7 3934022401
8 5315011201
9 6903360001
10 8699068801
11 10702137601
12 12912566401
13 15330355201
14 17955504001
15 20788012801
16 23827881601
17 27075110401
18 30529699201

[2649601,139478401,483667201,1035216001,
 1794124801,2760393601,3934022401,5315011201,
 6903360001,8699068801,10702137601,12912566401,
 15330355201,17955504001,20788012801,23827881601,
 27075110401,30529699201]

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Last modified December 3 11:58 EST 2020. Contains 338900 sequences. (Running on oeis4.)