A361238 Number of nonequivalent noncrossing 4-gonal cacti with n polygons up to rotation.

1, 1, 1, 8, 63, 664, 7462, 90896, 1159587, 15369761, 209785576, 2933152208, 41833725570, 606735330572, 8926655086328, 132969013796640, 2002168332793035, 30435351234214599, 466570991414368225, 7206553709798780480, 112066631802051120600, 1753396593921234013664

Offset

0,4

Links

Andrew Howroyd, Table of n, a(n) for n = 0..500

Crossrefs

Column 4 of A361236.

Cf. A361241.

Sequence in context: A302399 A356337 A084096 * A353993 A189943 A358324

Adjacent sequences: A361235 A361236 A361237 * A361239 A361240 A361241

Keyword

nonn

Author

Andrew Howroyd, Mar 05 2023

Status

approved