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A026898 as a simple table

na(n)
01
12
24
39
423
566
6210
7733
82781
911378
1049864
11232769
121151915
136018786
1433087206
15190780213
161150653921
177241710930
1847454745804
19323154696185
202282779990495
2116700904488706
22126356632390298
23987303454928973
247957133905608837
2566071772829247410

[1,2,4,9,23,66,210,733,2781,11378,49864,232769,
 1151915,6018786,33087206,190780213,1150653921,
 7241710930,47454745804,323154696185,2282779990495,
 16700904488706,126356632390298,987303454928973,
 7957133905608837,66071772829247410]