23023

Appears in sequences

• Number of exterior points formed by extending diagonals of n-gon in general position.at n=20A005701
• Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 2,3,0.at n=4A037631
• Number of scalars which can be constructed from the Riemann tensor and metric tensor in n dimensions.at n=22A050297
• Partial sums of A051877.at n=9A050403
• Partial sums of second pentagonal numbers with even index (A049453).at n=22A051895
• Partial sums of A034263.at n=10A051947
• a(n) = (11*n+5)*(n+4)*(n+3)*(n+2)*(n+1)/120.at n=10A056118
• Numbers k such that gcd(3k,8^k+1) = 3 but k does not divide the numerator of B(2k) (the Bernoulli numbers).at n=34A070193
• Numbers whose name in American English is a word-palindrome, reading the same forward and backward.at n=31A081365
• Higher dimensional figurate numbers based on 12-gonal numbers A051624.at n=6A093646
• Seventh column (m=6) of (1,6)-Pascal triangle A096956.at n=10A097297
• a(n) = n*(n-1)*(n-2)*(n+3)/12.at n=23A117662
• Numerators of triangle T(n,k), n>=0, 0<=k<=n, read by rows: T(n,k) is the coefficient of x^(2k+1) in polynomial v_n(x), used to approximate x->sin(Pi*x)/Pi.at n=25A144859
• a(n) = 1001*n.at n=22A153814
• Fibonacci sequence beginning 12, 7.at n=17A206423
• Number of partitions p of n such that the number of parts having multiplicity 1 is not a part and max(p) - min(p) is not a part.at n=44A241450
• a(n) = n*(n + 1)*(n + 2)*(n + 3)*(n^2 - n + 5)/120.at n=10A256860
• a(n) is the smallest squarefree number k with n prime factors such that gcd(k, d2-d1) = 1 for all coprime pairs of divisors of k, 1 < d1 < d2 < k.at n=3A287935
• Expansion of 1 / ((1 - x)^7*(1 + x)^4).at n=20A299336
• Number of parts in all partitions of n with largest multiplicity two.at n=36A320372