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A107590 as a simple table

na(n)
01
11
21
32
45
515
650
7181
8698
92837
1012062
1153374
12244923
131162536
145697119
1528786266
16149814059
17802436166
184420515689
1925031466730
20145616087486
21869760092469
225330945435272
2333508699787635
24215863606818041

[1,1,1,2,5,15,50,181,698,2837,12062,53374,244923,
 1162536,5697119,28786266,149814059,802436166,
 4420515689,25031466730,145616087486,869760092469,
 5330945435272,33508699787635,215863606818041]