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 A146094 #26 Jun 20 2025 14:22:08 %S A146094 1,1,2,1,3,0,3,1,0,3,3,2,1,1,2,1,3,0,3,1,0,3,3,2,1,1,2,1,3,0,3,1,0,3, %T A146094 3,2,1,1,2,1,3,0,3,1,0,3,3,2,1,1,2,1,3,0,3,1,0,3,3,2,1,1,2,1,3,0,3,1, %U A146094 0,3,3,2,1,1,2,1,3,0,3,1,0,3,3,2,1,1,2,1,3,0,3,1,0,3,3,2,1,1,2,1,3,0,3,1,0 %N A146094 Bell numbers (A000110) read mod 4. %H A146094 G. C. Greubel, <a href="/A146094/b146094.txt">Table of n, a(n) for n = 0..2500</a> %H A146094 P. Pleasants, W. Lunnon, and N. Stephens, <a href="http://matwbn.icm.edu.pl/ksiazki/aa/aa35/aa3511.pdf">Arithmetic properties of Bell numbers to a composite modulus I</a>, Acta Arithmetica 35 (1979), pp. 1-16. %H A146094 <a href="/index/Rec#order_12">Index entries for linear recurrences with constant coefficients</a>, signature (0,0,0,0,0,0,0,0,0,0,0,1). %F A146094 a(n) = a(n-12). - _Charles R Greathouse IV_, Jul 06 2011 [See A054767. - _Jianing Song_, Jun 20 2025] %t A146094 Mod[BellB[Range[0, 50]], 4] (* _G. C. Greubel_, Jan 30 2016 *) %o A146094 (Magma) [Bell(n) mod 4: n in [0..100]]; // _Vincenzo Librandi_, Jan 30 2016 %Y A146094 Cf. A000110, A146093-A146122 (Bell numbers read mod 3 to mod 32). %Y A146094 Cf. A054767 (periods). %K A146094 nonn,easy %O A146094 0,3 %A A146094 _N. J. A. Sloane_, Feb 07 2009