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A261900 as a simple table

na(n)
01
11
26
348
4496
56251
692638
71574650
830150120
9641425785
1014999294310
11382187185380
1210535027302800
13312263647871175
149901291024374750
15334357521973224750
1611978152435322073000
17453670047374482063125
1818110938144465399983750
19759996114581823934815000

[1,1,6,48,496,6251,92638,1574650,30150120,
 641425785,14999294310,382187185380,10535027302800,
 312263647871175,9901291024374750,
 334357521973224750,11978152435322073000,
 453670047374482063125,18110938144465399983750,
 759996114581823934815000]