A099778 Number of perfect matchings in a certain class of graphs.

6728, 75272, 1113032, 14601608, 206700000, 2832600000, 39626000000, 549520000000, 7662700000000, 106600000000000, 1485300000000000, 20681000000000000, 288070000000000000, 4011900000000000000

Offset

0,1

Links

Table of n, a(n) for n=0..13.

Crossrefs

Sequence in context: A028543 A145320 A035905 * A049507 A064160 A249463

Adjacent sequences: A099775 A099776 A099777 * A099779 A099780 A099781

Keyword

nonn,obsc

Author

jind (lemonegg(AT)163.com), Nov 12 2004

Extensions

I would like a better description as well as the author's name! - N. J. A. Sloane, Nov 12 2004

Status

approved