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A265720 as a simple table

na(n)
01
10
2100
31100011
410000
511110001111
61000000
7111111000111111
8100000000
91111111100011111111
1010000000000
1111111111110001111111111
121000000000000
13111111111111000111111111111
14100000000000000
151111111111111100011111111111111
1610000000000000000

[1,0,100,1100011,10000,11110001111,1000000,
 111111000111111,100000000,1111111100011111111,
 10000000000,11111111110001111111111,1000000000000,
 111111111111000111111111111,100000000000000,
 1111111111111100011111111111111,10000000000000000]