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A285013 Number of periodic palindromic structures of length n using an infinite alphabet. 2
1, 2, 2, 5, 5, 13, 15, 41, 52, 144, 203, 578, 877, 2605, 4140, 12869, 21147, 69178, 115975, 398766, 678570, 2450406, 4213597, 15939952, 27644437, 109304914, 190899322 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

See A285012 for additional information. Permuting the symbols will not change the structure.

LINKS

Table of n, a(n) for n=1..27.

CROSSREFS

Row sums of A285012.

Cf. A284841, A165137.

Sequence in context: A056505 A056506 A056507 * A095014 A129996 A208355

Adjacent sequences:  A285010 A285011 A285012 * A285014 A285015 A285016

KEYWORD

nonn,more

AUTHOR

Andrew Howroyd, Apr 07 2017

STATUS

approved

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Last modified February 22 15:12 EST 2018. Contains 299454 sequences. (Running on oeis4.)