69351

Appears in sequences

• Sum of the trapezoid weights of all peakless Motzkin paths of length n (n>=0).at n=15A171853
• Second elementary symmetric function of the first n terms of (1,2,2,3,3,4,4,5,5...).at n=35A203298
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + n*b(n-1), where a(0) = 1, a(1) = 4, b(0) = 2, b(1) = 3, and (a(n)) and (b(n)) are increasing complementary sequences.at n=17A296290
• Column 2 of triangle in A288180.at n=18A333281