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A281670 as a simple table

na(n)
01
11
2111
30
410111
510000
61110111
710000
8101010111
9101111000
1011110001011
11101000
121011110111011
131000001101000
14111011000001011
151000011101010
1610101011000111011
1710111100010000000
181111000101010111111
1910101111000000
20101111011110001011011

[1,1,111,0,10111,10000,1110111,10000,101010111,
 101111000,11110001011,101000,1011110111011,
 1000001101000,111011000001011,1000011101010,
 10101011000111011,10111100010000000,
 1111000101010111111,10101111000000,
 101111011110001011011]