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Appears in sequences

• The r-th term of the n-th row of the following array contains the sum of r successively decreasing integers beginning from n, 0 < r <= n (see Example).at n=26A110426
• a(n) = 3*a(n-2) - a(n-3) with a(0)=0, a(1)=3, a(2)=0.at n=18A214699