A392390 Number of one-sided polybends with n cells.

1, 3, 4, 10, 13, 28, 44, 85, 139, 263, 450, 815, 1403, 2540, 4447, 7868, 13769, 24500, 43106, 75685, 132865, 234600, 412731, 722450, 1267901, 2230016, 3917654, 6847502, 12004150, 21063678, 36947904, 64523312, 112983428, 197934436, 346735329, 605134987, 1058544744

Offset

1,2

Comments

See A392389 for details.

Links

Table of n, a(n) for n=1..37.

Formula

a(n) = A392391(n)/4 if n is odd, because a polybend with an odd number of cells cannot have any rotational symmetry.

Apparently, a(n) = A006744(n) for odd n.

Crossrefs

Cf. A006744, A390994, A392389 (free), A392391 (fixed), A333249 (closed, by enclosed area).

Sequence in context: A143372 A035594 A167273 * A096380 A309478 A329805

Adjacent sequences: A392387 A392388 A392389 * A392391 A392392 A392393

Keyword

nonn

Author

Pontus von Brömssen, Jan 10 2026

Extensions

a(28)-a(37) from Christian Sievers, Jan 13 2026

Status

approved