92671

Properties

Appears in sequences

• Number of permutations of length n which avoid the patterns 321, 1342, 1423.at n=20A116730
• Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 2X4 el 1,1 1,2 1,3 1,4 2,4 with any orientation.at n=10A146018
• Number of n X n binary arrays symmetric about the diagonal and under 90-degree rotation with all ones connected only in a 2 X 4 el 1,1 1,2 1,3 1,4 2,4 with any orientation.at n=22A146020
• Number of n X n binary arrays symmetric about the diagonal and under 90-degree rotation with all ones connected only in a 2 X 4 el 1,1 1,2 1,3 1,4 2,4 with any orientation.at n=23A146020
• Triangle T(n,k) read by rows: the number of semigroups of orientation-preserving partial transformations on n element with right waist k.at n=49A289714
• a(n) is the numerator of Sum_{primes p < n} 1/(n-p).at n=34A305700
• Prime numbersat n=8951