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1 result for “sequences”
Formulae (1)
Probability & Combinatorics
Advanced
Catalan Number
C
n
=
1
n
+
1
(
2
n
n
)
C_n = \frac{1}{n+1}\binom{2n}{n}
C
n
=
n
+
1
1
(
n
2
n
)
Counts many recursive structures such as balanced parentheses.