250991

Appears in sequences

• a(n) = 9*a(n-1) - 10*a(n-2); a(0)=0, a(1)=1.at n=7A178869
• Number of -1..1 arrays of n elements with first, second and third differences also in -1..1.at n=29A202117
• Solution of the complementary equation a(n) = 3*a(n-1) + b(n-1), where a(0) = 1, a(1) = 2, b(0) = 3, and (a(n)) and (b(n)) are increasing complementary sequences.at n=11A295133