23180

Appears in sequences

• a(n) = (F(4*n) - F(n))/2, where F=A000045 (the Fibonacci sequence).at n=6A049672
• Number of permutations of length n which avoid the patterns 1234, 1432, 2413.at n=9A116801
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 1), (0, -1, 1), (0, 1, -1), (0, 1, 0), (1, 0, 0)}.at n=8A150171
• a(n) = 16*n^2 + 2*n.at n=37A158056
• Number of 5-bead necklaces labeled with numbers -n..n not allowing reversal, with sum zero and avoiding the pattern z z+1 z+2.at n=9A209074
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 555", based on the 5-celled von Neumann neighborhood.at n=27A272922
• Numbers k for which rank of the elliptic curve y^2=x^3+k*x is 4.at n=20A309031
• Records of A058249: (Smallest prime >= 2^n) - (largest prime <= 2^n).at n=41A331620
• Primitive practical numbers (A267124) with a record gap to the next primitive practical number.at n=13A334883
• Triangle read by rows: T(n,k) is the number of partitions of a 4-colored set of n objects into exactly k parts with 0 <= k <= n.at n=48A382341
• a(n) = 2*binomial(n,2) + 3*binomial(n,3) + 4*binomial(n,4).at n=20A384852