This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A230116 #5 Oct 10 2013 08:08:06 %S A230116 1,3,7,9,17,51,127,129,257,771,1799,2313,4369,13107,32767,32769,65537, %T A230116 196611,458759,589833,1114129,3342387,8323199,8454273,16843009, %U A230116 50529027,117901063,151587081,286331153,858993459,2147483647,2147483649,4294967297,12884901891 %N A230116 Value of row n in triangle A166360 when seen as binary number. %C A230116 a(n) = sum(A166360(n,k)*2^(k-1): k=1..n). %H A230116 Reinhard Zumkeller, <a href="/A230116/b230116.txt">Table of n, a(n) for n = 1..1000</a> %e A230116 . n A166360(n,1..n) A007088(a(n)) a(n) %e A230116 . --- ----------------------------- --------------- ----- %e A230116 . 1 1 1 1 %e A230116 . 2 1 1 11 3 %e A230116 . 3 1 1 1 111 7 %e A230116 . 4 1 0 0 1 1001 9 %e A230116 . 5 1 0 0 0 1 10001 17 %e A230116 . 6 1 1 0 0 1 1 110011 51 %e A230116 . 7 1 1 1 1 1 1 1 1111111 127 %e A230116 . 8 1 0 0 0 0 0 0 1 10000001 129 %e A230116 . 9 1 0 0 0 0 0 0 0 1 100000001 257 %e A230116 . 10 1 1 0 0 0 0 0 0 1 1 1100000011 771 %e A230116 . 11 1 1 1 0 0 0 0 0 1 1 1 11100000111 1799 %e A230116 . 12 1 0 0 1 0 0 0 0 1 0 0 1 100100001001 2313 %e A230116 . 13 1 0 0 0 1 0 0 0 1 0 0 0 1 1000100010001 4369 %e A230116 . 14 1 1 0 0 1 1 0 0 1 1 0 0 1 1 11001100110011 13107 %e A230116 . 15 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 111111111111111 32767 . %o A230116 (Haskell) %o A230116 a230116 = foldr (\u v-> 2*v + u) 0 . map toInteger . a166360_row %Y A230116 Cf. A001317, A001263. %K A230116 nonn %O A230116 1,2 %A A230116 _Reinhard Zumkeller_, Oct 10 2013