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A107031 as a simple table

na(n)
01
12
23
34
47
512
625
756
8145
9422
101389
115072
1220283
1387996
14412663
152087868
1611361831
1766155642
18409567833
192680486870
2018465061963
21133504614880
221011121118741
238008145020804
2466201411633209
25570006877641976

[1,2,3,4,7,12,25,56,145,422,1389,5072,20283,87996,
 412663,2087868,11361831,66155642,409567833,
 2680486870,18465061963,133504614880,1011121118741,
 8008145020804,66201411633209,570006877641976]