A028376 Triangle read by rows: T(n,m) = Sum Catalan(n-k)*Catalan(k), k=0..m.

0, 0, 1, 0, 1, 2, 0, 2, 3, 5, 0, 5, 7, 9, 14, 0, 14, 19, 23, 28, 42, 0, 42, 56, 66, 76, 90, 132, 0, 132, 174, 202, 227, 255, 297, 429, 0, 429, 561, 645, 715, 785, 869, 1001, 1430, 0, 1430, 1859, 2123, 2333, 2529, 2739, 3003, 3432, 4862, 0, 4862, 6292, 7150

Offset

0,6

Links

Table of n, a(n) for n=0..58.

Example

0;
0,1;
0,1,2;
0,2,3,5;
0,5,7,9,14;
0,14,19,23,28,42; ...

Crossrefs

See A028364 for a better version. Cf. A028377, A028378.

Sequence in context: A279679 A261096 A257092 * A059235 A261216 A308107

Adjacent sequences: A028373 A028374 A028375 * A028377 A028378 A028379

Keyword

tabl,nonn,easy

Author

Wouter Meeussen

Status

approved