320320

Appears in sequences

• Degrees of irreducible representations of Fischer group Fi22.at n=27A003913
• Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 3,2,0.at n=5A037673
• Triangle read by rows: T(n,m) = 4^m * (2*n+1)! / ( (2*n - 2*m + 1)! * (2*m)! ), row n has n+1 terms.at n=31A085840
• If X_1,...,X_n is a partition of a 2n-set X into 2-blocks then a(n) is equal to the number of 6-subsets of X containing none of X_i, (i=1,...n).at n=9A130812
• a(n) = binomial(n+9,9)*2^n.at n=6A140354
• Lenstra numbers with 6 divisors in a single residue class.at n=2A146544
• 9-quantum transitions in systems of N >= 9 spin 1/2 particles, in columns by combination indices.at n=12A213351
• Numbers n such that sum of decimal digits of n equals number of prime divisors of n counted with multiplicity and sum of distinct decimal digits of n equals number of distinct primes dividing n.at n=27A280911
• Number of Dyck paths of semilength n such that each positive level has exactly nine peaks.at n=25A288325
• Triangle read by rows: T(n,k) = number of colored weighted Motzkin paths ending at (n,k).at n=29A293172
• Denominators of the partial sums of the reciprocals of the dodecagonal numbers (k + 1)*(5*k + 1) = A051624(k+1), for k >= 0.at n=5A294521
• a(n) is the least integer that can be expressed as the difference of two octagonal numbers in exactly n ways.at n=16A334037
• Triangle read by rows: T(n,k) is the number of oriented graphs on n labeled nodes with k arcs, n >= 0, k = 0..n*(n-1)/2.at n=32A350749
• a(n) = A349745(n) divided by 2 if it is even, and 0 if A349745(n) is odd.at n=8A351548
• Positions of records in A227872, i.e., integers whose number of odious divisors sets a new record.at n=29A355969
• Triangle read by rows. Number T(n, k) of partitions of the multiset [1, 1, 1, 2, 2, 2, ..., n, n, n] into k nonempty subsets, for 3 <= k <= 3n.at n=39A360037
• Triangle read by rows: T(n, k) = binomial(n - 1, k - 1)*binomial(n + k, k).at n=52A386789