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A143972
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Eigentriangle by rows, A143971 * (A108300 * 0^(n-k)); 1<=k<=1
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1
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1, 4, 1, 7, 4, 5, 10, 7, 20, 16, 13, 10, 35, 64, 53, 16, 13, 50, 112, 212, 175, 19, 16, 65, 160, 371, 700, 578, 22, 19, 80, 208, 530, 1225, 2312, 1909, 25, 28, 95, 256, 689, 1750, 4046, 7636, 6305, 28, 25, 110, 304, 848, 2275, 5780, 23363, 25220, 20824
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OFFSET
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1,2
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COMMENTS
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Right border = A108300: (1, 1, 5, 16, 53, 175, 578,...). Row sums = (1, 5, 16, 53, 175, 578,...) = INVERT transform of (1, 4, 7, 10,...).
Sum of n-th row terms = rightmost term of next row.
Comment in A108300 states that (5, 16, 53, 175,...) is related to the numbers of hydrogen bonds in hydrocarbons.
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LINKS
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FORMULA
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Triangle A143971 = (1; 4,1; 7,4,1; 10,7,4,1;...). A108300 * 0^(n-k) = an infinite lower triangular matrix with A108300 (1, 1, 5, 16, 53, 175, 578, 1909,...) in the main diagonal and the rest zeros. By rows, = termwise products of n-th row terms of A143971 and n terms of A108300.
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EXAMPLE
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First few rows of the triangle =
1;
4, 1;
7, 4, 5;
10, 7, 10, 16;
13, 10, 35, 64, 53;
16, 13, 50, 112, 212, 175;
19, 16, 65, 160, 371, 700, 578;
22, 19, 80, 208, 530, 1225, 2312, 1909;
25, 22, 95, 256, 689, 1750, 4046, 7636, 6305;
... Example: row 4 = (10, 7, 20, 16) = termwise products of (10, 7, 4, 1) and (1, 1, 5, 16) = (10*1, 7*1, 4*5, 1*16), where (10, 7, 4, 1) = row 4 of triangle A143971.
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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