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 A131439 #19 Jun 02 2025 00:31:49 %S A131439 1,7,14,18,22,26,30,34,38,42,46,50,54,58,62,66,70,74,78,82,86,90,94, %T A131439 98,102,106,110,114,118,122,126,130,134,138,142,146,150,154,158,162, %U A131439 166,170,174,178,182 %N A131439 Inverse binomial transform of A131438 (assuming zero offset in both sequences). %C A131439 Conjecture: The sequence appears to be (1, 7, ...) followed by 4k + 14; k=0,1,2,...; thus: (1, 7, 14, 18, 22, 26, ...). %C A131439 Inverse binomial transform of this sequence = (1, 6, 1, -4, 7, -10, 13, -16, 19, -22, ...). %F A131439 A007318^(-1) * A131438. %F A131439 a(n) = 2*a(n-1) - a(n-2) for n>4. G.f.: -x*(x+1)*(3*x^2-4*x-1) / (x-1)^2. [_Colin Barker_, Jan 06 2013] %e A131439 (1, 3, 3, 1) dot (1, 7, 14, 18) = 82 = A131438(4). %Y A131439 Cf. A131436, A131437, A131438. %K A131439 nonn %O A131439 1,2 %A A131439 _Gary W. Adamson_, Jul 11 2007