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A255906 as a simple table

na(n)
01
11
24
316
476
5400
62356
715200
8106644
9806320
106526580
1156231024
12513207740
134941362512
1450013751812
15530481210672
165880285873060
1767954587978448
18816935340368068
1910196643652651664
20131904973822724540
211765645473517011568
2224420203895517396180

[1,1,4,16,76,400,2356,15200,106644,806320,6526580,
 56231024,513207740,4941362512,50013751812,
 530481210672,5880285873060,67954587978448,
 816935340368068,10196643652651664,
 131904973822724540,1765645473517011568,
 24420203895517396180]