34189

Appears in sequences

• a(n) = number of (s(0),s(1),...,s(n)) such that every s(i) is a nonnegative integer, s(0) = 1, s(n) = 2, |s(1) - s(0)| = 1, |s(i) - s(i-1)| <= 1 for i >= 2. Also a(n) = T(n,n-1), where T is the array in A026120; a(n) = U(n,n+1), where U is the array in A026148.at n=10A026123
• Molien series for group G_{1,2}^{8} of order 1536.at n=42A051462
• a(0)=1, a(1)=1, a(n) = 13*a(n/2) for n=2,4,6,..., a(n) = 12*a((n-1)/2) + a((n+1)/2) for n=3,5,7,....at n=23A116524
• Area of consecutive Prime-Indexed Prime rectangles.at n=12A119658
• a(n) = numerator(Sum_{k=1..n} (-1)^(k+1)/(prime(k)-1)).at n=9A128647
• Product of the two primes with indices equal to the members of the n-th twin prime pair.at n=5A161763
• The least number s > 1 having exactly n fives in the periodic part of the continued fraction of sqrt(s).at n=24A206585
• a(0)=1, a(n) = least k > a(n-1) such that k*a(n-1) is a triangular number.at n=25A213005
• Number of nondecreasing -2..2 vectors of length n whose dot product with some lexicographically greater or equal nondecreasing -2..2 vector equals n.at n=27A226416
• Composites in base 10 that remain composite in exactly four bases b, 2 <= b <= 10, expansions interpreted as decimal numbers.at n=16A256354
• Start with a square; at each stage add a square at each expandable vertex so that the ratio of the side of the squares at stage n+1 and at stage n is the golden ratio phi=0.618...; a(n) is the number of squares at n-th stage.at n=11A269962
• Sequence of pairwise relatively prime numbers of class P_4 (see comment in A275246).at n=20A275248
• Semiprimes whose binary and ternary representations are prime when read in decimal.at n=38A279052
• Number of nX2 0..1 arrays with every element unequal to 2, 3, 5 or 7 king-move adjacent elements, with upper left element zero.at n=15A304257