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A055990 as a simple table

na(n)
11
24
314
450
5181
6657
72385
88657
931422
10114051
11413966
121502555
135453761
1419795288
1571850128
16260791401
17946583628
183435774958
1912470688498
2045264335853
21164294064481
22596331286321
232164478699633
247856317702310
2528515747394555
26103502414271126

[1,4,14,50,181,657,2385,8657,31422,114051,413966,
 1502555,5453761,19795288,71850128,260791401,
 946583628,3435774958,12470688498,45264335853,
 164294064481,596331286321,2164478699633,
 7856317702310,28515747394555,103502414271126]