18222

Appears in sequences

• Unimodal analog of Fibonacci numbers: a(n+1) = Sum_{k=0..floor(n/2)} A071922(n-k,k).at n=17A072176
• Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=1, r=4, I={0,2}.at n=34A079974
• a(n) = prime(prime(prime(prime(A028815(n) - 1) - 1) - 1) - 1) - 1.at n=8A141132
• a(n) = prime(prime(prime(prime(n) - 1) - 1) - 1) - 1, where prime(n) is the n-th prime.at n=18A141217
• 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, 0), (0, -1, 1), (0, 1, 0), (1, 0, 0), (1, 1, -1)}.at n=8A150108
• a(n) = 2025*n^2 - n.at n=2A156855
• a(n) = 9*n^2 - 3.at n=44A157872
• Number of nondecreasing integer sequences of length 26 with sum zero and sum of absolute values 2n.at n=13A158160
• Number of (n+1)X6 0..3 arrays with every 2X2 subblock having nonzero determinant and commuting with every horizontal or vertical neighbor.at n=7A206340
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 182", based on the 5-celled von Neumann neighborhood.at n=35A270632
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 537", based on the 5-celled von Neumann neighborhood.at n=26A272792
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 774", based on the 5-celled von Neumann neighborhood.at n=45A273504
• The number of integers not representable as a sum of n-th powers of primes.at n=5A275743
• a(n) is the number of edges formed by n-secting the angles of a hexagon.at n=35A335735