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A303844 Number of noncrossing path sets on n nodes up to rotation with each path having at least two nodes. 6
1, 0, 1, 1, 4, 7, 26, 69, 246, 818, 2976, 10791, 40591, 153959, 594753, 2320696, 9159498, 36467012, 146411208, 592046830, 2409946566, 9867745442, 40623068380, 168058068487, 698400767839, 2914407151002, 12208398647345, 51322369218674, 216463504458521 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

LINKS

Andrew Howroyd, Table of n, a(n) for n = 0..200

EXAMPLE

Case n=4: There are 4 possibilities:

.

   o---o   o   o   o---o   o---o

           |   |     /       \

   o---o   o---o   o---o   o---o

.

PROG

(PARI) \\ See A303732 for NCPathSetsModCyclic

Vec(NCPathSetsModCyclic(vector(30, k, k>1)))

CROSSREFS

Cf. A303730, A303732, A303836, A303839.

Sequence in context: A075686 A077441 A269744 * A197789 A076148 A203570

Adjacent sequences:  A303841 A303842 A303843 * A303845 A303846 A303847

KEYWORD

nonn

AUTHOR

Andrew Howroyd, May 01 2018

STATUS

approved

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Last modified June 16 06:46 EDT 2019. Contains 324145 sequences. (Running on oeis4.)