A006773 Sum of squared spans of 2n-step polygons on square lattice. (Formerly M3959)

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

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 A352175 A038744

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