67092480

Appears in sequences

• Expansion of e.g.f. x^4*exp(x)^2.at n=15A052796
• Number of primitive (aperiodic) palindromes using a maximum of four different symbols.at n=25A056460
• Numbers m such that A007947(m) = A007947(k) and A007947(m+1) = A007947(k+1), for some k < m.at n=12A087914
• a(n) = 4a(n-1) - 6a(n-2) + 4a(n-3), n > 3; a(0) = 3, a(1) = 2, a(2) = a(3) = 0.at n=26A133209
• Denominators of expansion of (Sum_{k=1..n} 1/k) - log(n(1+1/(2n))) - gamma.at n=10A189049
• Number of bitstrings of length n (with at least two runs) where the last two runs have different lengths.at n=25A208901
• Total area of all squares and rectangles after 2^n stages in the toothpick structure of A139250, assuming the toothpicks have length 2.at n=13A211012
• Number of non-palindromic n-tuples of 4 distinct elements.at n=12A242026
• Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 261", based on the 5-celled von Neumann neighborhood.at n=12A271061
• Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 657", based on the 5-celled von Neumann neighborhood.at n=12A273335
• Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 721", based on the 5-celled von Neumann neighborhood.at n=12A273446
• Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 65", based on the 5-celled von Neumann neighborhood.at n=25A278755
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 54", based on the 5-celled von Neumann neighborhood.at n=28A285611
• a(n) = 2*a(n-1) + 2*a(n-2) - 4*a(n-3), a(1) = 0, a(2) = 0, a(3) = 8.at n=24A297619
• Number of binary carry-connected subsets of [n] containing n (for n > 0).at n=27A306299
• Pairs of integers (k, m) ordered by m with 1 < k < m such that k has the same prime divisors as m, and, k+1 has the same prime divisors as m+1.at n=25A343101
• Numbers k such that A246601(k) > 2*k.at n=17A359084