44739242

Appears in sequences

• a(2n) = 2*a(2n-1), a(2n+1) = 2*a(2n)+1 (also a(n) is the n-th number without consecutive equal binary digits).at n=26A000975
• a(n) = (8^n + 2*(-1)^n)/3.at n=9A007613
• Barlow packings with group R3(bar)m(SO) that repeat after 6n+3 layers.at n=26A011954
• a(n) = a(n-1) + 2*a(n-2) with a(0)=0, a(1)=2.at n=26A014113
• a(n) = (2/3)*(4^n-1).at n=13A020988
• a(n) = C(n,0) + C(n,3) + ... + C(n,3[n/3]).at n=27A024493
• a(n) = a(n-1) + 2*a(n-2) + 2, for n>=3, where a(0)= 1, a(1)= 2, a(2)= 4.at n=25A026644
• Numbers that are repdigits in base 4.at n=38A048329
• a(n) = 2^n - A056188(n).at n=26A056189
• Numerator of the expected time to finish a random Tower of Hanoi problem with n disks using optimal moves.at n=26A060590
• Number of 132 and 213-avoiding derangements of {1,2,...,n}.at n=27A061547
• Sequence A075166 interpreted as binary numbers and converted to decimal.at n=40A075165
• Expansion of (1 - x)/((1 + x)*(1 - 2*x)).at n=27A078008
• Size of "uniform" Hamming covers of distance 1, that is, Hamming covers in which all vectors of equal weight are treated the same, included or excluded from the cover together.at n=26A081374
• a(n) = 2^n - A081374(n).at n=25A083322
• Partial sums of a Jacobsthal related sequence.at n=26A084184
• Binomial transform of (-1)^mod(n,3) (A257075).at n=27A086953
• Smallest numbers having in binary representation exactly n maximal groups of consecutive zeros.at n=13A087120
• a(n) is the smallest number such that the exponent of p=2 factor in 6*a(n)+4 equals n.at n=27A087231
• Generalized Jacobsthal sequence.at n=26A087628