



1, 2, 2, 3, 2, 3, 4, 2, 3, 4, 5, 2, 3, 4, 5, 6, 2, 3, 4, 5, 6, 7, 2, 3, 4, 5, 6, 7, 8, 2, 3, 4, 5, 6, 7, 8, 9, 2, 3, 4, 5, 6, 7, 8, 9, 10, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12
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OFFSET

1,2


COMMENTS

Row sums = A034856; (1, 4, 8, 13, 19, 26, 34,...).


LINKS

Table of n, a(n) for n=1..78.


FORMULA

A130296 + A002260  A000012 as infinite lower triangular matrices.
T(n, 1) = n, T(n, k) = k for k > 1.  Michel Marcus, Feb 12 2014


EXAMPLE

First few rows of the triangle are:
1;
2, 2;
3, 2, 3;
4, 2, 3, 4;
5, 2, 3, 4, 5;
6, 2, 3, 4, 5, 6;
7, 2, 3, 4, 5, 6, 7;
...


PROG

(PARI) t(n, k) = if (k==1, n, k); \\ Michel Marcus, Feb 12 2014


CROSSREFS

Cf. A130296, A002260, A034856.
Sequence in context: A182744 A104324 A193212 * A222111 A222438 A222027
Adjacent sequences: A131815 A131816 A131817 * A131819 A131820 A131821


KEYWORD

nonn,tabl


AUTHOR

Gary W. Adamson, Jul 18 2007


EXTENSIONS

More terms from Michel Marcus, Feb 12 2014


STATUS

approved



