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A079823 Consider the triangle shown below; sequence contains the concatenation of numbers read at a 45-degree angle upwards with horizontal beginning with the first term of a row. 2
1, 2, 43, 75, 1186, 16129, 22171310, 29231814, 3730241915, 4638312520, 564739322621, 675748403327, 79685849413428, 92806959504235, 10693817060514336, 121107948271615244 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

   1

   2  3

   4  5  6

   7  8  9 10

  11 12 13 14 15

  16 17 18 19 20 21

  ...

LINKS

Table of n, a(n) for n=1..16.

MAPLE

read("transforms"):

A079823aux := proc(n, k)

    A000124(n)+k ;

end proc:

A079823 := proc(n)

    local L, k, n0 ;

    n0 := n-1 ;

    L := [] ;

    for k from 0 do

        if k > n0-k then

            break;

        end if;

        L := [op(L), A079823aux(n0-k, k)] ;

    end do:

    digcatL(L) ;

end proc: # R. J. Mathar, Aug 23 2012

CROSSREFS

Cf. A056536, A079824.

Sequence in context: A137415 A090194 A107200 * A107156 A062582 A073594

Adjacent sequences:  A079820 A079821 A079822 * A079824 A079825 A079826

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Feb 11 2003

EXTENSIONS

More terms from Jason D. W. Taff (jtaff(AT)jburroughs.org), Oct 31 2003

Corrected by Philippe Deléham, Feb 16 2004

STATUS

approved

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Last modified November 12 22:16 EST 2019. Contains 329079 sequences. (Running on oeis4.)