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A006773 Sum of squared spans of 2n-step polygons on square lattice.
(Formerly M3959)
1
0, 1, 5, 30, 186, 1164, 7344, 46732, 299604, 1932900, 12537542, 81705782, 534663812, 3511466838, 23136724382, 152888000934, 1012925595468, 6726766841438, 44767880394634, 298522284224824, 1994187071224056, 13343458013982572, 89420609914983270, 600088861692380354, 4032377457462571694, 27129080022839863318, 182726605700552001998 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

REFERENCES

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

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

A. J. Guttmann and I. G. Enting, The size and number of rings on the square lattice, J. Phys. A 21 (1988), L165-L172.

CROSSREFS

Cf. A006772.

Sequence in context: A076036 A195257 A161407 * A059273 A038744 A098663

Adjacent sequences:  A006770 A006771 A006772 * A006774 A006775 A006776

KEYWORD

nonn

AUTHOR

N. J. A. Sloane

EXTENSIONS

Name corrected, more terms from Andrey Zabolotskiy, Nov 09 2018

STATUS

approved

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Last modified November 22 00:32 EST 2019. Contains 329383 sequences. (Running on oeis4.)