265721

Appears in sequences

• a(n) = (3^n + 1)/2.at n=12A007051
• a(n) = 2*a(n-1) + 3*a(n-2), a(0) = a(1) = 1.at n=12A046717
• Number of periodic palindromic structures of length n using a maximum of three different symbols.at n=25A056504
• Binomial transform of Jacobsthal gap sequence (A080924).at n=12A080925
• Table T(m,n) = (3^m + 5^n)/2, for m, n = 0, 2, 4, 6, ... read by antidiagonals downwards.at n=27A081458
• a(n) = (3^(2*n) + 1) / 2.at n=6A083884
• a(n) = 3*a(n-1) + a(n-2) - 3*a(n-3).at n=12A103425
• Numerator of Sum_{i=1..n} 1/(t(i)^t(i)) where t(i) = i-th 3-almost prime.at n=1A118062
• Number of set partitions with at most 3 blocks; number of Dyck paths of height at most 4; dimension of space of symmetric polynomials in 3 noncommuting variables.at n=13A124302
• a(n) = 3*a(n-1) - a(n-3) + 3*a(n-4), with initial values 2,5,13,40.at n=11A133448
• a(n) = 3*a(n-1) - a(n-3) + 3*a(n-4), with initial values 2,4,13,40.at n=11A133453
• a(n) = 4*a(n-1) - 7*a(n-2) + 6*a(n-3) - 3*a(n-4), starting with 0, 1, 2, 3.at n=25A134581
• a(0)=1; a(3n+1) = a(3n)+1, a(3n+2) = a(3n+1) + a(3n) (=3*A000244), a(3n+3) = a(3n+2) + a(3n) (=A003462(n+2)).at n=34A140298
• a(n) = (3*3^n-(-1)^n)/2.at n=11A164907
• a(n) = (3^n+1)/(3-(-1)^n).at n=12A167205
• a(n) = ceiling((n+1)^4/2).at n=26A171714
• a(n) = ((2*n+1)^4+1)/2.at n=13A175110
• a(n) = ((2*n + 1)^6 + 1)/2.at n=4A175113
• Number of compositions of even natural numbers into 6 parts <= n.at n=8A191489
• Numbers of the form (7^j + 9^k)/2, for j and k >= 0.at n=42A226795