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A038273
Triangle whose (i,j)-th entry is binomial(i,j)*7^(i-j)*7^j.
1
1, 7, 7, 49, 98, 49, 343, 1029, 1029, 343, 2401, 9604, 14406, 9604, 2401, 16807, 84035, 168070, 168070, 84035, 16807, 117649, 705894, 1764735, 2352980, 1764735, 705894, 117649, 823543, 5764801, 17294403, 28824005, 28824005
OFFSET
0,2
REFERENCES
B. N. Cyvin et al., Isomer enumeration of unbranched catacondensed polygonal systems with pentagons and heptagons, Match, No. 34 (Oct 1996), pp. 109-121.
CROSSREFS
Sequence in context: A173294 A165828 A161343 * A245132 A222462 A214887
KEYWORD
nonn,tabl,easy
AUTHOR
STATUS
approved