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 A008928 #32 Apr 30 2025 09:11:13 %S A008928 1,1,1,2,3,6,10,21,38,77,144,293,563,1131,2205,4434,8711,17466,34506, %T A008928 69169,137247,274677,546081,1093217,2177556,4356756,8688370,17381926, %U A008928 34691608,69394626,138578144,277197191,553794526,1107654097,2213527055,4427345544,8849519773 %N A008928 Number of increasing sequences of addition chain type with maximal element n. %C A008928 This sequence counts all addition chains for n. - _David W. Wilson_, Apr 01 2006 %C A008928 In other words, a(n) = the number of increasing addition chains ending in n. - _Don Reble_, Apr 09 2006 %H A008928 Martin Fuller, <a href="/A008928/b008928.txt">Table of n, a(n) for n = 1..64</a> %H A008928 Don Reble, <a href="/A008928/a008928.py.txt">Python program</a> %H A008928 Mauro Torelli, <a href="http://www.numdam.org/item?id=ITA_2006__40_2_107_0">Increasing integer sequences and Goldbach's conjecture</a>, RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, 40:2 (2006), pp. 107-121. %Y A008928 Cf. A008927, A079301, A008933. %K A008928 nonn %O A008928 1,4 %A A008928 Mauro Torelli (torelli(AT)hermes.mc.dsi.unimi.it) %E A008928 More terms from _David W. Wilson_, Apr 01 2006 %E A008928 More terms from _Don Reble_, Apr 09 2006