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 A287869 #7 Feb 24 2019 01:15:15 %S A287869 1,1,3,2,4,4,3,7,6,6,5,11,10,9,8,8,18,16,15,12,9,13,29,26,24,20,14,11, %T A287869 21,47,42,39,32,23,17,12,34,76,68,63,52,37,28,19,14,55,123,110,102,84, %U A287869 60,45,31,22,16,89,199,178,165,136,97,73,50,36,25,17 %N A287869 Wythoff array with one extra column, read by antidiagonals downwards. %D A287869 Conway, John; Ryba, Alex; The extra Fibonacci series and the Empire State Building. Math. Intelligencer 38 (2016), no. 1, 41-48. %e A287869 The extended Wythoff array is the Wythoff array with two extra columns, giving the row number n and A000201(n), separated from the main array by a vertical bar: %e A287869 0 1 | 1 2 3 5 8 13 21 34 55 89 144 ... %e A287869 1 3 | 4 7 11 18 29 47 76 123 199 322 521 ... %e A287869 2 4 | 6 10 16 26 42 68 110 178 288 466 754 ... %e A287869 3 6 | 9 15 24 39 63 102 165 267 432 699 1131 ... %e A287869 4 8 | 12 20 32 52 84 136 220 356 576 932 1508 ... %e A287869 5 9 | 14 23 37 60 97 157 254 411 665 1076 1741 ... %e A287869 6 11 | 17 28 45 73 118 191 309 500 809 1309 2118 ... %e A287869 7 12 | 19 31 50 81 131 212 343 555 898 1453 2351 ... %e A287869 8 14 | 22 36 58 94 152 246 398 644 1042 1686 2728 ... %e A287869 9 16 | 25 41 66 107 173 280 453 733 1186 1919 3105 ... %e A287869 10 17 | 27 44 71 115 186 301 487 788 1275 2063 3338 ... %e A287869 11 19 | 30 49 79 ... %e A287869 12 21 | 33 54 87 ... %e A287869 13 22 | 35 57 92 ... %e A287869 14 24 | 38 62 ... %e A287869 15 25 | 40 65 ... %e A287869 16 27 | 43 70 ... %e A287869 17 29 | 46 75 ... %e A287869 18 30 | 48 78 ... %e A287869 19 32 | 51 83 ... %e A287869 20 33 | 53 86 ... %e A287869 21 35 | 56 91 ... %e A287869 22 37 | 59 96 ... %e A287869 23 38 | 61 99 ... %e A287869 24 40 | 64 ... %e A287869 25 42 | 67 ... %e A287869 26 43 | 69 ... %e A287869 27 45 | 72 ... %e A287869 28 46 | 74 ... %e A287869 29 48 | 77 ... %e A287869 30 50 | 80 ... %e A287869 31 51 | 82 ... %e A287869 32 53 | 85 ... %e A287869 33 55 | 88 ... %e A287869 34 56 | 90 ... %e A287869 35 58 | 93 ... %e A287869 36 59 | 95 ... %e A287869 37 61 | 98 ... %e A287869 38 63 | ... %e A287869 ... %e A287869 The present sequence presents the array with just the rightmost extra column. %Y A287869 Cf. A035513 (the Wythoff array), A287870, A000201. %K A287869 nonn,tabl %O A287869 1,3 %A A287869 _N. J. A. Sloane_, Jun 14 2017