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A115967 as a simple table

na(n)
01
12
28
328
4104
5384
61428
75316
819820
973948
10276044
111030796
123850048
1314382248
1453732172
15200759004
16750134520
172802980640
1810474015164
1939139487292
20146259311592
21546558514368
222042458815324
237632600834924
2428522903136796

[1,2,8,28,104,384,1428,5316,19820,73948,276044,
 1030796,3850048,14382248,53732172,200759004,
 750134520,2802980640,10474015164,39139487292,
 146259311592,546558514368,2042458815324,
 7632600834924,28522903136796]