23300

Appears in sequences

• 12-gonal (or dodecagonal) pyramidal numbers: a(n) = n*(n+1)*(10*n-7)/6.at n=24A007587
• Numbers k that, when expressed in base 4 and then interpreted in base 9, give a multiple of k.at n=23A062925
• Sequence A014486 shown in base 4.at n=36A085185
• Convolution of 4^n and floor(n/2).at n=9A097138
• Triangle read by rows: T(n,k) (k>=0) is the number of RNA secondary structures of size n (i.e., with n nodes) having k arcs that are covered by other arcs.at n=55A110317
• Number of partitions of n such that the largest part is coprime to every other part.at n=44A130690
• Triangle read by rows: number of circular permutations of [1..n] with k progressions of rise 1, distance 2 and length 3 (n >= 3, k >= 0).at n=23A216719
• Second column of A216719.at n=5A216721
• Number of partitions of n such that neither the number of parts having multiplicity >1 nor the number of distinct parts is a part.at n=47A241412
• Number of parity preserving permutations of the set {1,2,...,n} with exactly k cycles.at n=58A246117
• Number of length 6+3 0..n arrays with every four consecutive terms having the sum of some three elements equal to three times the fourth.at n=10A248543
• Triangle read by rows, T(n,k) = sum(j=0..k-1, S(n+1,j+1)*S(n,k-j)) where S denotes the Stirling cycle numbers A132393, T(0,0)=1, n>=0, 0<=k<=2n.at n=28A254881
• Number of length-n binary strings s whose longest repeated suffix appears exactly twice in s.at n=14A284462
• Successive numbers arising from the Moessner construction of the sequence A010790 (n!*(n+1)!) on pages 64, 65 of Conway-Guy's "Book of Numbers".at n=18A346595