A107310 Triangle read by rows, related to enumeration of polycyclic conjugated hydrocarbons (see Brunvoll reference for precise definition).

1, 1, 1, 1, 2, 1, 5, 11, 7, 1, 25, 60, 46, 12, 1, 125, 325, 290, 106, 17, 1

Offset

0,5

References

J. Brunvoll, S. J. Cyvin and B. N. Cyvin, Isomer enumeration of polygonal systems..., J. Molec. Struct. (Theochem), 364 (1996), 1-13.

Links

Table of n, a(n) for n=0..20.

Example

Triangle begins:
1
1 1
1 2 1
5 11 7 1
25 60 46 12 1

Crossrefs

Sequence in context: A222574 A222680 A110352 * A277279 A049950 A095216

Adjacent sequences: A107307 A107308 A107309 * A107311 A107312 A107313

Keyword

nonn,tabl

Author

N. J. A. Sloane, Aug 18 2006

Status

approved