22890

Appears in sequences

• Numbers whose base-4 representation contains exactly four 1's and four 2's.at n=5A045109
• Number of partitions of {1,..,n} into lists with an even number of lists of size 1, where a list means an ordered subset (cf. A000262).at n=7A111752
• Numbers k such that the first 9 decimal digits of the k-th Fibonacci number is 1-9 pandigital.at n=14A112516
• Triangle read by rows: T(n,k) = number of peakless Motzkin paths of length n and having k weak ascents (1 <= k <= ceiling(n/3)).at n=48A114711
• Triangle read by rows: T(n,k) is the number of paths in the first quadrant from (0,0) to (n,0), consisting of steps U=(1,1), D=(1,-1), h=(1,0) and H=(2,0), having k U steps (0 <= k <= floor(n/2)).at n=45A132883
• a(n) = primorial(n) mod n!.at n=8A182254
• Number of (w,x,y,z) with all terms in {1,...,n} and |x-y|<|y-z|.at n=15A212681
• a(n) is the least number k such that the number of distinct digits in the prime factorization of k is n (counting terms of the form p^1 as p).at n=6A254317
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 246", based on the 5-celled von Neumann neighborhood.at n=36A271010
• Number of cyclic permutations of length n avoiding the pattern 231 (equivalently, 312).at n=13A309506
• Triangle read by rows: T(n,k) is the total number of bubbles of size k found in linear chord diagrams on 2n vertices.at n=44A367000
• Products of 5 distinct primes that are sandwiched between squarefree semiprime numbers.at n=19A376949