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A134483
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Triangle read by rows: T(n,k)=2n+k-2; 1<=k<=n.
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1
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1, 3, 4, 5, 6, 7, 7, 8, 9, 10, 9, 10, 11, 12, 13, 11, 12, 13, 14, 15, 6, 13, 14, 15, 16, 17, 18, 19, 15, 16, 17, 18, 19, 20, 21, 22, 17, 18, 19, 20, 21, 22, 23, 24, 25, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Row sums = the heptagonal numbers, A000566: (1, 7, 18, 34, 55, 81,...).
Row n consists of n consecutive integers starting with 2n-1. - Emeric Deutsch (deutsch(AT)duke.poly.edu), Nov 04 2007
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FORMULA
| T(n,k)=2n+k-2 for 1<=k<=n. G.f.= tz(1+z+2tz-4tz^2)/[(1-z)^2(1-tz)^2] - Emeric Deutsch (deutsch(AT)duke.poly.edu), Nov 04 2007
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EXAMPLE
| First few rows of the triangle are:
1;
3, 4;
5, 6, 7;
7, 8, 9, 10;
9, 10, 11, 12, 13;
...
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MAPLE
| for n to 10 do seq(2*n+k-2, k=1..n) end do; # yields sequence in triangular form - Emeric Deutsch (deutsch(AT)duke.poly.edu), Nov 04 2007
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CROSSREFS
| Cf. A000566.
Sequence in context: A121854 A196119 A198458 * A121151 A088243 A154660
Adjacent sequences: A134480 A134481 A134482 * A134484 A134485 A134486
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KEYWORD
| nonn,tabl
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AUTHOR
| Gary W. Adamson (qntmpkt(AT)yahoo.com), Oct 27 2007
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