1774036

Appears in sequences

• Number of compositions of n avoiding the pattern 1111.at n=26A232464
• Solution of the complementary equation a(n) = 2*a(n-2) + b(n-2), where a(0) = 1, a(1) = 2, b(0) = 3, and (a(n)) and (b(n)) are increasing complementary sequences.at n=36A295998