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A226855 as a simple table

na(n)
00
11
24
312
444
5175
6762
73605
818384
9100404
10584070
113601895
1223451540
13160633681
141153896772
158668821600
1667943174000
17554327140739
184698491153454
1941299244789989
20375844030441560

[0,1,4,12,44,175,762,3605,18384,100404,584070,
 3601895,23451540,160633681,1153896772,8668821600,
 67943174000,554327140739,4698491153454,
 41299244789989,375844030441560]