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A155586 A modified Catalan sequence array. 1
1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 5, 2, 1, 1, 1, 14, 5, 2, 1, 1, 1, 42, 14, 5, 2, 1, 1, 1, 132, 42, 14, 5, 2, 1, 1, 1, 429, 132, 42, 14, 5, 2, 1, 1, 1, 1430, 429, 132, 42, 14, 5, 2, 1, 1, 1, 4862, 1430, 429, 132, 42, 14, 5, 2, 1, 1, 1, 16796, 4862, 1430, 429, 132, 42, 14, 5, 2, 1, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,8

COMMENTS

Row sums are A155587. Stieltjes associate array to A091491.

LINKS

Table of n, a(n) for n=0..77.

FORMULA

Number triangle T(n,k)=[k<=n]*if(k=0,1,A000108(n-k))

EXAMPLE

Triangle begins

1,

1, 1,

1, 1, 1,

1, 2, 1, 1,

1, 5, 2, 1, 1,

1, 14, 5, 2, 1, 1,

1, 42, 14, 5, 2, 1, 1,

1, 132, 42, 14, 5, 2, 1, 1,

1, 429, 132, 42, 14, 5, 2, 1, 1,

1, 1430, 429, 132, 42, 14, 5, 2, 1, 1

CROSSREFS

Sequence in context: A260148 A099940 A157249 * A069739 A066060 A008550

Adjacent sequences:  A155583 A155584 A155585 * A155587 A155588 A155589

KEYWORD

easy,nonn,tabl

AUTHOR

Paul Barry, Jan 24 2009

STATUS

approved

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Last modified February 24 18:24 EST 2018. Contains 299628 sequences. (Running on oeis4.)