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A196568
Binomial coefficients of the form C(k, 3) that are products of two other binomial coefficients of the form C(k, 3).
1
560, 19600, 43680, 893200, 1521520, 7207200, 29269240, 2845642800, 26595476600, 249466897680
OFFSET
1,1
COMMENTS
a(11), if it exists, > C(5*10^6, 3). - D. S. McNeil, Oct 26 2011
EXAMPLE
560 = C( 16, 3) = C( 8, 3) * C( 5, 3);
19600 = C( 50, 3) = C(16, 3) * C( 7, 3);
43680 = C( 65, 3) = C(14, 3) * C(10, 3);
893200 = C(176, 3) = C(30, 3) * C(12, 3).
CROSSREFS
Subsequence of A364151 (more than 2 factors allowed).
Cf. A188630 (analog for triangular numbers).
Sequence in context: A104591 A318119 A364151 * A171347 A193171 A013487
KEYWORD
nonn,more
AUTHOR
Kausthub Gudipati, Oct 04 2011
EXTENSIONS
Name clarified by Pontus von Brömssen, Jun 22 2023
STATUS
approved