A323938 Irregular triangle read by rows: Isomer numbers I(n,k) of k-6-catapolyheptagons.

1, 1, 1, 2, 4, 4, 2, 6, 14, 22, 11, 4, 20, 72, 122, 104, 44, 10

Offset

2,4

Links

Table of n, a(n) for n=2..19.

S. J. Cyvin, J. Brunvoll, and B. N. Cyvin, Enumeration of unbranched catacondensed polygonal systems: general solution for two kinds of polygons, Journal of Chemical Information and Computer Sciences, 37 (1997), 460-466. See Table 7.

Example

Triangle begins:
1, 2, 1,
4, 11, 10, 3,
16, 56, 73, 42, 9,
64, 272, 460, 387, 162, 27,
...

Crossrefs

Cf. A323937.

Sequence in context: A206396 A206389 A206503 * A122592 A099264 A011172

Adjacent sequences: A323935 A323936 A323937 * A323939 A323940 A323941

Keyword

nonn,tabf,more

Author

N. J. A. Sloane, Feb 09 2019

Status

approved