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A215288 as a simple table

na(n)
11
26
330
4280
52100
623100
7210210
82522520
925729704
10325909584
113585005424
1247117214144
13546896235600
147383099180600
1589212448432250
161229149289511000
1715323394475903800
18214527522662653200
192742051789669912720

[1,6,30,280,2100,23100,210210,2522520,25729704,
 325909584,3585005424,47117214144,546896235600,
 7383099180600,89212448432250,1229149289511000,
 15323394475903800,214527522662653200,
 2742051789669912720]