1,3

Triangle A084938 * [1, 1, 1, 2, 6, 23, 105, 550,...] shifts left to

[1, 1, 2, 6, 23, 105, 550,...].

Eigentriangle A165490 = A084938 * its eigensequence, A165489 as a diagonalized

infinite lower triangular matrix.

The sequence can be obtained by shifting down triangle A084938 one row, then

inserting a "1" as the first term, obtaining a new triangle Q. Then take the

Lim_{n->inf.} Q^n, obtaining a shifted left column vector = A165489 prefaced

with a 1. Delete the first 1, obtaining [1, 1, 2, 6, 23, 105, 550, 3236,...].

A084938, A165490

Sequence in context: A137548 A080108 A113227 this_sequence A125273 A130908 A000772

Adjacent sequences: A165486 A165487 A165488 this_sequence A165490 A165491 A165492

eigen,nonn

Gary W. Adamson (qntmpkt(AT)yahoo.com), Sep 20 2009