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A152907 Irregular triangle read by rows, numbers in A007318 repeated four times . 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 4, 4, 4, 4, 6, 6, 6, 6, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 5, 5, 5, 5, 10, 10, 10, 10, 10, 10, 10, 10, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 6, 6, 6, 6, 15, 15, 15, 15, 20, 20 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,17

LINKS

Table of n, a(n) for n=0..97.

FORMULA

Sum_{k, 0<=k<=4n+3}T(n,k)=2^(n+2).

EXAMPLE

Triangle begins : 1,1,1,1 ; 1,1,1,1,1,1,1,1 ; 1,1,1,1,2,2,2,2,1,1,1,1 ; 1,1,1,1,3,3,3,3,3,3,3,3,1,1,1,1, ; 1,1,1,1,4,4,4,4,6,6,6,6,4,4,4,4,1,1,1,1 ; 1,1,1,1,5,5,5,5,10,10,10,10,10,10,10,10,5,5,5,5,1,1,1,1 ; ...

CROSSREFS

Cf. A007318, A152905, A152906

Sequence in context: A130836 A279185 A161385 * A078786 A102677 A145884

Adjacent sequences:  A152904 A152905 A152906 * A152908 A152909 A152910

KEYWORD

nonn,tabf

AUTHOR

Philippe Deléham, Dec 14 2008

STATUS

approved

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Last modified June 14 15:06 EDT 2021. Contains 345025 sequences. (Running on oeis4.)