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A247499 as a simple table

na(n)
01
12
26
325
4135
5896
67042
763841
8654901
97491574
1094470926
111301130777
1219423173211
13312256205652
145376809244458
1598700795776641
161923638785344457
1739661911384761866
18862362968121278038
1919717031047061570777
20472849461034147171791
2111866892471399392308232

[1,2,6,25,135,896,7042,63841,654901,7491574,
 94470926,1301130777,19423173211,312256205652,
 5376809244458,98700795776641,1923638785344457,
 39661911384761866,862362968121278038,
 19717031047061570777,472849461034147171791,
 11866892471399392308232]