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A038393 Number of 4n-step self-avoiding closed paths on first quadrant grid, passing through origin, symmetric about line y = x. 0
1, 1, 2, 6, 20, 78, 342, 1608, 7966, 41054, 218342, 1191038, 6635164, 37621952, 216557220, 1262829914, 7447921572 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..16.

CROSSREFS

Cf. A034010.

Sequence in context: A150182 A098469 A081563 * A027221 A300514 A150183

Adjacent sequences:  A038390 A038391 A038392 * A038394 A038395 A038396

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified November 21 22:16 EST 2019. Contains 329383 sequences. (Running on oeis4.)