29785

Appears in sequences

• a(1)=1; a(2)=2; a(3)=3; a(n) = Sum_{k=3..n-1} (a(k) + a(k-1) + a(k-2)).at n=12A078344
• Number of base 17 n-digit numbers with adjacent digits differing by three or less.at n=5A126485
• a(n) = n*(n+2)*(2*n-1)/3. Also, row sums of triangle A131422.at n=34A131423
• Duplicate of A131423.at n=34A143371
• a(n) = 36*n^2 - 17*n + 2.at n=28A157265
• Hankel transform of A158500.at n=34A158501
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + n*b(n), where a(0) = 1, a(1) = 3, b(0) = 2, b(1) = 4, b(2) = 5, and (a(n)) and (b(n)) are increasing complementary sequences.at n=15A296294
• a(n) = Sum_{k=1..n} phi(gcd(k, n))^(n/gcd(k, n) - 1).at n=34A342542
• Numbers whose prime indices have arithmetic and geometric mean differing by one.at n=8A358332
• Antidiagonal sums of A343053.at n=23A377521