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A001818 as a simple table

na(n)
01
11
29
3225
411025
5893025
6108056025
718261468225
84108830350625
91187451971330625
10428670161650355625
11189043541287806830625
12100004033341249813400625
1362502520838281133375390625
1445564337691106946230659765625
1538319607998220941779984862890625

[1,1,9,225,11025,893025,108056025,18261468225,
 4108830350625,1187451971330625,428670161650355625,
 189043541287806830625,100004033341249813400625,
 62502520838281133375390625,
 45564337691106946230659765625,
 38319607998220941779984862890625]