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A331448 a(0) = 0 by convention; for n>0, a(n) is the number of edges in the n-th figure shown in A255011 (meaning the figure with 4n points on the perimeter). 5
0, 8, 92, 596, 1936, 6020, 11088, 26260, 42144, 72296, 107832, 183340, 222940, 371100, 466936, 609916, 804504, 1139632, 1288536, 1813288, 2012676, 2536572, 3142008, 3997580, 4230340, 5430444, 6331892, 7360512, 8262568, 10367804 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

By Euler's formula, a(n) = A331449(n) + A255011(n) - 1.

LINKS

Lars Blomberg, Table of n, a(n) for n = 0..52

CROSSREFS

Cf. A255011, A331449.

For the circular analog see A006533, A007678, A007569, A135565.

Sequence in context: A303743 A187157 A332597 * A215057 A222400 A280159

Adjacent sequences:  A331445 A331446 A331447 * A331449 A331450 A331451

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jan 23 2020, based on a comment from Michael De Vlieger in A255011.

EXTENSIONS

a(11)-a(29) from Giovanni Resta, Jan 28 2020

STATUS

approved

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Last modified December 4 21:09 EST 2020. Contains 338938 sequences. (Running on oeis4.)