18717

Appears in sequences

• Number of 5-leaf rooted trees with n levels.at n=16A007715
• Positive numbers k such that k and 4*k are anagrams in base 9 (written in base 9).at n=27A023081
• Starting positions of strings of three 5's in the decimal expansion of Pi.at n=14A083620
• Number of permutations of length n which avoid the patterns 231, 51234.at n=10A116848
• Number of n X 6 arrays of the minimum value of corresponding elements and their horizontal or vertical neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..1 n X 6 array.at n=16A219500
• Numbers n such that A277118(n) = 17.at n=10A277119
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n-2)*b(n-1), where a(0) = 2, a(1) = 3, b(0) = 1, b(1) = 4, and (a(n)) and (b(n)) are increasing complementary sequences.at n=14A296263
• Numbers k such that 365*2^k+1 is prime.at n=25A323007
• Triangle read by rows: T(n, k) is the number of walks of length n on the Z X Z grid with unit steps in all four directions (NSWE) starting at (0, 0), and ending on the vertical line x = 0 if k = 0, or on the line x = k or x = -(n + 1 - k) if k > 0.at n=48A379822
• Triangle read by rows: T(n, k) is the number of walks of length n on the Z X Z grid with unit steps in all four directions (NSWE) starting at (0, 0), and ending on the vertical line x = 0 if k = 0, or on the line x = k or x = -(n + 1 - k) if k > 0.at n=52A379822
• Number of connected induced subgraphs of the 1-skeleton of the n-th Johnson solid, up to symmetries of that solid.at n=29A384377