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A259644 as a simple table

na(n)
01
12
25
331
42419
5176795035
6883922739668546300971
71511516294872733607299090320742127160367108420362968907

[1,2,5,31,2419,176795035,883922739668546300971,
 15115162948727336072990903207421271603671084203629\
 68907]