20305

Appears in sequences

• Expansion of 1/(1 - 12*x + x^2).at n=4A004191
• Denominators of continued fraction convergents to sqrt(35).at n=9A041059
• Denominators of continued fraction convergents to sqrt(140).at n=9A041257
• Denominators of continued fraction convergents to sqrt(315).at n=9A041595
• Denominators of continued fraction convergents to sqrt(560).at n=9A042073
• a(n) = n^4 - 3*n^2 + 1.at n=12A057722
• Chebyshev polynomial of the second kind U[n,x] evaluated at x=n+2.at n=4A107995
• Number of ordered rooted trees where each subtree from given node has the same number of nodes.at n=25A127525
• Chebyshev polynomial of the second kind U(4,n).at n=6A144139
• Number triangle associated to Chebyshev polynomials of the second kind.at n=61A228161
• Timestamps Hmmss where H,mm,ss are three consecutive primes, 0 < H < 24.at n=0A234631
• Expansion of Product_{k>=1} 1/(1 - x^(2*k) + x^(3*k)).at n=36A276526
• Prime time numbers on 6-digit clocks: numbers of the form HMMSS where H, MM, SS are primes, H < 24, MM and SS < 60.at n=19A295014
• Number of nonequivalent (mod D_8) ways to place 3 points on an n X n point grid so that no point is equally distant from two other points on the same row or the same column.at n=9A296996
• Number of ordered multiset partitions of integer partitions of n where the sequence of GCDs of the partitions is weakly increasing.at n=12A319001
• Square array T(n,k), n >= 0, k >= 0, read by antidiagonals, where T(n,k) is Chebyshev polynomial of the second kind U_{n}(x), evaluated at x=k.at n=59A323182
• Number of nontrivial equivalence classes of S_n under the {1234,3412} pattern-replacement equivalence.at n=44A330395
• Triangular array read by rows. T(n,k) is the number of invertible n X n matrices over GF(2) that decompose into the direct sum of k cyclic matrices, 0<=k<=n, n>=0.at n=19A346081
• Number of integer partitions of n where the least part is the unique mode.at n=40A364193
• G.f. A(x) satisfies A(x) = x + A(A(x)^2) + A(A(x)^3).at n=8A378255