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A302248
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Irregular triangle read by rows in which the odd-indexed terms of the n-th row together with the even-indexed terms of the same row but listed in reverse order give the n-th row of triangle A299778.
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0
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1, 3, 2, 2, 7, 0, 3, 3, 12, 0, 0, 4, 4, 0, 15, 0, 0, 5, 5, 3, 9, 0, 0, 9, 6, 6, 0, 0, 28, 0, 0, 0, 7, 7, 0, 0, 12, 0, 0, 12, 8, 8, 8, 0, 0, 31, 0, 0, 0, 0, 9, 9, 0, 0, 0, 39, 0, 0, 0, 0, 10, 10, 0, 0, 0, 42, 0, 0, 0, 0, 11, 11, 5, 0, 0, 5, 18, 0, 0, 18, 0, 0, 12, 12, 0, 0, 0, 0, 60, 0, 0, 0, 0, 0, 13, 13, 0, 0, 5, 0
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OFFSET
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1,2
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LINKS
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EXAMPLE
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Triangle begins (rows 1..28):
1;
3;
2, 2;
7, 0;
3, 3;
12, 0, 0;
4, 4, 0;
15, 0, 0;
5, 5, 3;
9, 0, 0, 9;
6, 6, 0, 0;
28, 0, 0, 0;
7, 7, 0, 0;
12, 0, 0, 12;
8, 8, 8, 0, 0;
31, 0, 0, 0, 0;
9, 9, 0, 0, 0;
39, 0, 0, 0, 0;
10, 10, 0, 0, 0;
42, 0, 0, 0, 0;
11, 11, 5, 0, 0, 5;
18, 0, 0, 18, 0, 0;
12, 12, 0, 0, 0, 0;
60, 0, 0, 0, 0, 0;
13, 13, 0, 0, 5, 0;
21, 0, 0, 21, 0, 0;
14, 14, 6, 0, 0, 6;
56, 0, 0, 0, 0, 0, 0;
...
For n = 21 the 21st row of A299778 is [11, 5, 0, 5, 0, 11], so the 21st row of this triangle is [11, 11, 5, 0, 0, 5].
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CROSSREFS
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The number of nonzero terms in row n is A237271(n).
The triangle with n rows contain A237590(n) nonzero terms.
Cf. A196020, A235791, A236104, A237048, A237270, A237591, A237593, A239660, A240542, A244050, A245092, A262626, A279387, A279388, A280851, A299778.
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KEYWORD
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nonn,tabf
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AUTHOR
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STATUS
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approved
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