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A099367 as a simple table

na(n)
00
11
249
32500
4127449
56497401
6331240000
716886742601
8860892632649
943888637522500
102237459621014849
11114066552034234801
125815156694124960000
13296458924848338725201
1415113590010571150025249
15770496631614280312562500

[0,1,49,2500,127449,6497401,331240000,16886742601,
 860892632649,43888637522500,2237459621014849,
 114066552034234801,5815156694124960000,
 296458924848338725201,15113590010571150025249,
 770496631614280312562500]