21271

Appears in sequences

• Number of partitions of n into Fibonacci parts (with 2 types of 1).at n=44A007000
• Number of certain stackings of n+1 squares on a double staircase.at n=17A055244
• Numbers k such that k and k^2 use only the digits 1, 2, 4, 5 and 7.at n=15A136989
• Number of n X 3 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..2 n X 3 array.at n=8A219590
• Number of zeroless strictly pandigital numbers divisible by the n-th prime.at n=6A339498
• E.g.f. satisfies A(x) = 1 + A(x)^3 * (1 - exp(-x)).at n=5A367164
• Table read by antidiagonals: Place k equally spaced points on each side of a regular n-gon and join every pair of these n*k points by a chord; T(n,k) (n >= 3, k >= 0) gives the number of vertices in the resulting planar graph.at n=39A367302
• Number of subsets of Z_n such that every ordered pair of distinct elements has a different difference.at n=30A382399