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 A144450 #7 Mar 07 2022 02:06:25 %S A144450 7,1,55,91,5,187,247,35,391,475,7,667,775,11,1015,1147,143,1435,1591, %T A144450 65,1927,2107,85,2491,2695,323,3127,3355,133,3835,4087,161,4615,4891, %U A144450 575,5467,5767,75,6391,6715,87,7387,7735,899,8455,8827,341,9595,9991,385,10807,11227,1295,12091,12535 %N A144450 Second bisection of A061039. %C A144450 Related to the Paschen spectrum of hydrogen. Contains only odd numbers. The sequence read modulo 9 is "full" and contains all numbers from 0 to 8. %H A144450 G. C. Greubel, <a href="/A144450/b144450.txt">Table of n, a(n) for n = 1..5000</a> %H A144450 <a href="/index/Rec#order_81">Index entries for linear recurrences with constant coefficients</a>, signature (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1). %F A144450 a(n) = A061039(2*n+2). %F A144450 a(n) = 3*a(n-27) - 3*a(n-54) + a(n-81). - _G. C. Greubel_, Mar 06 2022 %t A144450 Numerator[1/9 - 1/(2*Range[2, 100])^2] (* _G. C. Greubel_, Mar 06 2022 *) %o A144450 (Sage) [numerator(1/9 -1/(2*n+2)^2) for n in (1..100)] # _G. C. Greubel_, Mar 06 2022 %Y A144450 Cf. A061039, A144448. %K A144450 nonn %O A144450 1,1 %A A144450 _Paul Curtz_, Oct 06 2008 %E A144450 Formula index corrected, extended by _R. J. Mathar_, Dec 02 2008