A334690 a(n) is the number of points in the interior of the n-th figure shown in A255011 (meaning the figure with 4n points on the perimeter).

1, 29, 245, 801, 2737, 4801, 12265, 19209, 33513, 49537, 87641, 101933, 178413, 220057, 286297, 379033, 551601, 606169, 880217, 951365, 1208965, 1507433, 1947785, 2002573, 2624309, 3055989, 3550317, 3954937, 5068921, 5062033, 6669541, 7081841, 8143061, 9364953, 10296329, 10918073, 13772225, 14842297, 16312317

Offset

1,2

Comments

a(n) = A331449(n) - 4*n. Computed from Lars Blomberg's b-file for A331449.

Links

N. J. A. Sloane, Table of n, a(n) for n = 1..52

Crossrefs

Cf. A255011, A331448, A331449.

These are the sums of the rows in A334691.

Sequence in context: A142559 A125366 A126524 * A027939 A146127 A146038

Adjacent sequences: A334687 A334688 A334689 * A334691 A334692 A334693

Keyword

nonn

Author

Scott R. Shannon and N. J. A. Sloane, May 17 2020

Status

approved