A196991 Number of fixed polycairos with n cells.

4, 10, 32, 112, 412, 1572, 6148, 24494, 98992, 404650, 1669496, 6941226, 29047568, 122235518, 516860460, 2194691988, 9353657788, 39996019860, 171525222740, 737541708318

Offset

1,1

Links

Table of n, a(n) for n=1..20.

Eric Weisstein's World of Mathematics, Polycairo

Crossrefs

Cf. A151534, A151535, A151536, A159866.

Sequence in context: A316103 A137954 A028283 * A390995 A151746 A378858

Adjacent sequences: A196988 A196989 A196990 * A196992 A196993 A196994

Keyword

nonn,hard

Author

Joseph Myers, Oct 08 2011

Extensions

a(16)-a(17) from Johann Peters, Aug 05 2024

a(18)-a(20) from John Mason, Jan 16 2026

Status

approved