A181644 Eigentriangle for the Catalan triangle (c(x), xc(x)), A033184.

1, 1, 1, 2, 1, 1, 6, 3, 1, 1, 22, 11, 4, 1, 1, 92, 46, 17, 5, 1, 1, 426, 213, 79, 24, 6, 1, 1, 2150, 1075, 399, 122, 32, 7, 1, 1, 11708, 5854, 2173, 665, 176, 41, 8, 1, 1, 68282, 34141, 12673, 3878, 1027, 242, 51, 9, 1, 1, 423948, 211974, 78683, 24075, 6373, 1502

Offset: 0

Author

Paul Barry, Nov 03 2010

Keywords

• easy
• nonn
• tabl

Comments

First column is essentially A091768. Inverse of A181645.

Examples

			Triangle begins
  1,
  1, 1,
  2, 1, 1,
  6, 3, 1, 1,
  22, 11, 4, 1, 1,
  92, 46, 17, 5, 1, 1,
  426, 213, 79, 24, 6, 1, 1,
  2150, 1075, 399, 122, 32, 7, 1, 1,
  11708, 5854, 2173, 665, 176, 41, 8, 1, 1
		

Links

• Paul Barry, Invariant number triangles, eigentriangles and Somos-4 sequences, arXiv preprint arXiv:1107.5490 [math.CO], 2011.

Crossrefs

Cf. A033184, A091768, A181645.