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 A217927 #45 Jul 19 2021 19:26:07 %S A217927 2,1,4,3,10,9,8,7,6,5,12,11,18,17,16,15,14,13,30,29,28,27,26,25,24,23, %T A217927 22,21,20,19,36,35,34,33,32,31,48,47,46,45,44,43,42,41,40,39,70,69,68, %U A217927 67,66,65,64,63,62,61,60,59,58,57,56,55,38,37,54,53,52,51,50,49,80,79,78,77,76,75,74,73,72,71,102,101,100,99,98,97,96,95,94,93,92,91,90,89 %N A217927 Elements of the horizontal ADOMAH periodic table written from right to left, from bottom to top. %C A217927 We first write a variant of the ADOMAH periodic table: %C A217927 1 2 %C A217927 5 6 7 8 9 10 3 4 %C A217927 21 22 23 24 25 26 27 28 29 30 13 14 15 16 17 18 11 12 %C A217927 57 to 70 39 40 41 42 43 44 45 46 47 48 31 32 33 34 35 36 19 20 (B) %C A217927 89 to 102 71 72 73 74 75 76 77 78 79 80 49 50 51 52 53 54 37 38 %C A217927 103104105106107108109110111112 81 82 83 84 85 86 55 56 %C A217927 113114115116117118 87 88 %C A217927 119120 %C A217927 (See A219388). %C A217927 It could be written vertically. %C A217927 Differences of (2,4,12,20,38,56,88,120,... = A168380) = 2,8,8,18,18,... = A093907 from a 118 terms table. %C A217927 The number of elements in the n-th period (2,8,18,32,32,18,8,2) is in A168281. Compare to A093907 = 2,8,8,18,18,32,32,50,...(extension of the Mendeleyev-Moseley-Seaborg table) and A137583 = 2,2,8,8,18,18,32,32. See the possible element 120 in A168208 (which must be clarified). %C A217927 The horizontal ADOMAH periodic table (2006) is %C A217927 119120 %C A217927 113114115116117118 87 88 %C A217927 103104105106107108109110111112 81 82 83 84 85 86 55 56 %C A217927 89 to 102 71 72 73 74 75 76 77 78 79 80 49 50 51 52 53 54 37 38 (A) %C A217927 57 to 70 39 40 41 42 43 44 45 46 47 48 31 32 33 34 35 36 19 20 %C A217927 21 22 23 24 25 26 27 28 29 30 13 14 15 16 17 18 11 12 %C A217927 5 6 7 8 9 10 3 4 %C A217927 1 2 %C A217927 Generally it is written vertically. %D A217927 Philip J. Stewart, "Charles Janet, Unrecognized genius of the periodic system", Foundations of Chemistry, January, 2009. ISSN 1386-4238. %H A217927 V. Tsimmerman, <a href="http://perfectperiodictable.com">ADOMAH Periodic Table</a> %Y A217927 Cf. A137325. %K A217927 nonn,full,fini,less %O A217927 1,1 %A A217927 _Paul Curtz_, Oct 15 2012 %E A217927 Reference given by _Jean-François Alcover_, Oct 22 2012 %E A217927 Typos corrected in comments by _Jean-François Alcover_, Nov 16 2012