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A172886 as a simple table

na(n)
1352128
2811889208811800
34791845694620286764862960
442869833252266149325697583980525320
5486080087657753670049657485797288505931441728

[352128,811889208811800,4791845694620286764862960,
 42869833252266149325697583980525320,
 486080087657753670049657485797288505931441728]