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A115650 Triangular numbers which are the sum of distinct double factorials (A006882). 2
1, 3, 6, 10, 15, 21, 28, 66, 105, 120, 153, 171, 435, 561, 946, 1378, 1485, 3916, 4005, 4278, 4851, 4950, 11781, 14365, 15576, 47586, 50086, 51360, 57970, 60378, 60726, 61425, 61776, 139128, 145530, 146070, 149878, 150426, 182710, 659526, 702705 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Double factorials 0!! and 1!! are not considered distinct. Note that double factorial (n!!) is different from (n!)!.
LINKS
EXAMPLE
T(527) = 19128 = 13!! + 10!! + 7!! + 6!!.
CROSSREFS
Sequence in context: A117520 A147846 A062099 * A025745 A175724 A335184
KEYWORD
nonn
AUTHOR
Giovanni Resta, Jan 28 2006
STATUS
approved

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Last modified July 15 14:56 EDT 2024. Contains 374333 sequences. (Running on oeis4.)