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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.

A337975 Multiplication table from A337946, read by antidiagonals.

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%I A337975 #14 Oct 09 2020 17:18:59
%S A337975 1,3,3,7,9,7,12,21,21,12,22,36,49,36,22,30,66,84,84,66,30,47,90,154,
%T A337975 144,154,90,47,61,141,210,264,264,210,141,61,85,183,329,360,484,360,
%U A337975 329,183,85,113,255,427,564,660,660,564,427,255,113,126,339,595,732,1034,900,1034,732,595,339,126
%N A337975 Multiplication table from A337946, read by antidiagonals.
%H A337975 Peter Kagey, <a href="/A337975/b337975.txt">Table of n, a(n) for n = 1..10011</a> (first 141 antidiagonals, flattened)
%e A337975 Multiplication table for A337946 begins:
%e A337975   *  |  1   3   7   12   22   30   47   61   85
%e A337975 -----+-----------------------------------------
%e A337975    1 |  1   3   7   12   22   30   47   61   85
%e A337975    3 |  3   9  21   36   66   90  141  183  255
%e A337975    7 |  7  21  49   84  154  210  329  427  595
%e A337975   12 | 12  36  84  144  264  360  564  732 1020
%e A337975   22 | 22  66 154  264  484  660 1034 1342 1870
%e A337975   30 | 30  90 210  360  660  900 1410 1830 2550
%e A337975   47 | 47 141 329  564 1034 1410 2209 2867 3995
%e A337975   61 | 61 183 427  732 1342 1830 2867 3721 5185
%e A337975   85 | 85 255 595 1020 1870 2550 3995 5185 7225
%Y A337975 Cf. A337662, A337946, A338017, A338034.
%Y A337975 Cf. A337973 (addition), A337974 (read by rows).
%K A337975 nonn,tabl
%O A337975 1,2
%A A337975 _Peter Kagey_, Oct 05 2020