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A112940 as a simple table

na(n)
01
11
25
345
4605
511045
6257005
77288245
8243870205
99401560645
10410141056205
1119966451812245
121072718714991005
1363033317759267045
144020725747388170605
15276661592017425909045
1620424931173615717011005

[1,1,5,45,605,11045,257005,7288245,243870205,
 9401560645,410141056205,19966451812245,
 1072718714991005,63033317759267045,
 4020725747388170605,276661592017425909045,
 20424931173615717011005]