A334700 Triangle read by rows: T(n,k) (n >= 1, 3 <= k <= n+2) = one-quarter of the number of k-sided cells in the n-th figure shown in A255011 (meaning the figure with 4n points on the perimeter).

1, 12, 2, 51, 28, 6, 170, 96, 14, 0, 415, 268, 112, 19, 2, 854, 598, 100, 14, 0, 0, 1587, 1309, 460, 126, 10, 0, 0

Offset

1,2

Comments

This is the triangle in A334699 with all entries divided by 4.

No formula is known.

For illustrations see A331452.

Links

Table of n, a(n) for n=1..28.

Scott R. Shannon, Data for triangles A334691 and A334699

Scott R. Shannon, Colored illustration for n = 2

Example

Triangle begins:
1,
12, 2,
51, 28, 6,
170, 96, 14, 0,
415, 268, 112, 19, 2,
854, 598, 100, 14, 0, 0,
1587, 1309, 460, 126, 10, 0, 0
...

Crossrefs

Cf. A255011, A331452, A331449, A334690, A334691, A334695, A334696, A334699.

Sequence in context: A360287 A040143 A163599 * A302799 A213059 A038328

Adjacent sequences: A334697 A334698 A334699 * A334701 A334702 A334703

Keyword

nonn,tabf,more

Author

Scott R. Shannon and N. J. A. Sloane, May 18 2020

Status

approved