210890

Appears in sequences

• Number of n X n 0..1 arrays with antidiagonals unimodal and rows and diagonals nondecreasing.at n=8A224032
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n-1) + n + 1, where a(0) = 1, a(1) = 2, b(0) = 3, and (a(n)) and (b(n)) are increasing complementary sequences.at n=21A294549