A260666 Number of patterns with perimeter n in the planar net 3.3.4.3.4, mirrors and holes are excluded.

0, 0, 1, 2, 1, 3, 6, 13

Offset

1,4

Comments

Inspired by A057729 which is in planar net 3.3.3.3.3.3.

Links

Table of n, a(n) for n=1..8.

Kival Ngaokrajang, Illustration of initial terms

Crossrefs

Cf. A057729.

Sequence in context: A049900 A024741 A024961 * A140644 A321651 A326308

Adjacent sequences: A260663 A260664 A260665 * A260667 A260668 A260669

Keyword

nonn,more

Author

Kival Ngaokrajang, Nov 14 2015

Status

approved