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EXAMPLE
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. n A180058 referred equal binomial coefficients (A007318) A059233
. - ------- ---------------------------------------------- -------
. 1 2 C (2, 1) 1
. 2 6 C (4, 2) C (6, 1) 2
. 3 120 C (10, 3) C (16, 2) C (120, 1) 3
. 4 3003 C (14, 6) C (15, 5) C (78, 2) C (3003, 1) 4 .
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