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A236903 Row sums of an analog of Pascal's triangle resulting from replacing addition with concatenation in the construction rule. 1
1, 2, 13, 224, 113335, 2222244446, 11111333333333555557, 22222222222222444444444444446666668, 1111111111111133333333333333333333333333335555555555555555555577777779 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Number of digits of a(n) is A001405(n).

a(2n) begins with exactly A000108(n) 1's. - Vladimir Shevelev, Feb 07 2014

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..12

EXAMPLE

Triangle begins

.                      1

.

.                 1         1

.

.            1        11         1

.

.       1        111       111        1

.

.  1       1111     111111     1111        1

MAPLE

a:= n-> add((10^binomial(n, k)-1)/9, k=0..n):

seq(a(n), n=0..8);  # Alois P. Heinz, Feb 01 2014

CROSSREFS

Cf. A001405, A007318.

Sequence in context: A069569 A255882 A015196 * A277452 A268703 A187648

Adjacent sequences:  A236900 A236901 A236902 * A236904 A236905 A236906

KEYWORD

nonn,base

AUTHOR

Vladimir Shevelev, Feb 01 2014

STATUS

approved

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Last modified May 11 13:41 EDT 2021. Contains 343791 sequences. (Running on oeis4.)