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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.

A257254 Transpose of square array A257253.

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%I A257254 #11 Sep 20 2016 13:26:57
%S A257254 1,3,1,10,3,1,21,5,3,1,55,14,10,3,1,78,11,7,5,3,1,136,26,22,14,10,3,1,
%T A257254 171,17,13,11,7,5,3,1,253,38,34,26,22,14,10,3,1,406,69,57,51,39,33,21,
%U A257254 5,3,1,465,29,23,19,17,13,11,7,10,3,1,666,93,87,69,57,51,39,33,21,5,3,1
%N A257254 Transpose of square array A257253.
%C A257254 See A257253.
%H A257254 Antti Karttunen, <a href="/A257254/b257254.txt">Table of n, a(n) for n = 1..3321; the first 81 antidiagonals of the array</a>
%e A257254 The top left corner of the array:
%e A257254   1, 3, 10, 21, 55, 78, 136, 171, 253, 406, 465, 666, 820, 903
%e A257254   1, 3,  5, 14, 11, 26,  17,  38,  69,  29,  93,  74,  41,  86
%e A257254   1, 3, 10,  7, 22, 13,  34,  57,  23,  87,  62,  37,  82, 129
%e A257254   1, 3,  5, 14, 11, 26,  51,  19,  69,  58,  31,  74, 123, 129
%e A257254   1, 3, 10,  7, 22, 39,  17,  57,  46,  29,  62, 111, 123,  43
%e A257254   1, 3,  5, 14, 33, 13,  51,  38,  23,  58,  93, 111,  41, 129
%e A257254   1, 3, 10, 21, 11, 39,  34,  19,  46,  87,  93,  37, 123,  86
%e A257254   1, 3,  5,  7, 33, 26,  17,  38,  69,  87,  31, 111,  82,  43
%e A257254   1, 3, 10, 21, 22, 13,  34,  57,  69,  29,  93,  74,  41, 129
%e A257254   1, 3,  5, 14, 11, 26,  51,  57,  23,  87,  62,  37, 123,  86
%e A257254   1, 3, 10,  7, 22, 39,  51,  19,  69,  58,  31, 111,  82, 129
%e A257254   1, 3,  5, 14, 33, 39,  17,  57,  46,  29,  93,  74, 123, 172
%e A257254   1, 3, 10,  7, 33, 13,  51,  38,  23,  87,  62, 111, 164,  86
%e A257254   1, 3,  5, 14, 11, 39,  34,  19,  69,  58,  93, 148,  82,  43
%e A257254   1, 3, 10, 21, 33, 26,  17,  57,  46,  87, 124,  74,  41,  86
%e A257254   1, 3,  5,  7, 22, 13,  51,  38,  69, 116,  62,  37,  82,  43
%e A257254   ...
%o A257254 (Scheme) (define (A257254 n) (A257253bi (A004736 n) (A002260 n))) ;; Code for A257253bi given in A257253.
%Y A257254 Transpose: A257253.
%Y A257254 Row 1: A008837.
%Y A257254 Cf. A083140, A083221, A257252 (same array but with terms multiplied by 2).
%K A257254 nonn,tabl
%O A257254 1,2
%A A257254 _Antti Karttunen_, Apr 29 2015