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).

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

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 A358884

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