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A085853 Triangle T(n, k) read by rows; given by [1, 1, 1, 1, 1, 1, 1, 1, ...] DELTA [1, 0, 2, 0, 2, 0, 3, 0, 2, 0, 4, 0, 2, 0, ...] (A000005 interspersed with 0's) where DELTA is Deléham's operator defined in A084938. 1
1, 1, 1, 2, 3, 1, 5, 11, 7, 1, 14, 42, 42, 15, 1, 42, 162, 227, 137, 31, 1, 132, 627, 1145, 996, 408, 63, 1, 429, 2432, 5516, 6345, 3849, 1143, 127, 1, 1430, 9453, 25752, 37141, 30238, 13634, 3062, 255, 1, 4862, 36821, 117581, 205138, 211512 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Alois P. Heinz, Rows n = 0..140, flattened

FORMULA

T(n,0)= A000108(n), Catalan numbers .

EXAMPLE

Triangle begins :

1;

1, 1;

2, 3, 1;

5, 11, 7, 1;

14, 42, 42, 15, 1; ...

CROSSREFS

Cf. A000005, A000012, A000108, A000225 (first subdiagonal).

Sequence in context: A144634 A178125 A147315 * A185997 A231733 A182822

Adjacent sequences:  A085850 A085851 A085852 * A085854 A085855 A085856

KEYWORD

nonn,tabl

AUTHOR

N. J. A. Sloane, Aug 16 2003

STATUS

approved

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Last modified August 20 18:56 EDT 2019. Contains 326154 sequences. (Running on oeis4.)