18918900

Appears in sequences

• Coefficients of Bessel polynomials y_n (x).at n=6A001880
• A Pell Jacobsthal product.at n=12A084169
• Another version of triangular array in A083061: triangle T(n,k), 0<=k<=n, read by rows; given by [0, 1, 3, 6, 10, 15, 21, 28, ...] DELTA [1, 2, 3, 4, 5, 6, 7, 8, ...] where DELTA is the operator defined in A084938.at n=43A094665
• Coefficients of polynomial in x multiplying sinh(x) in the modified spherical Bessel function of the first kind i_n(x).at n=56A094674
• Triangle read by rows: row n gives number of matchings of size 0<=k<=n (edges) in the complete graph on 2*n >= 2 vertices.at n=41A119743
• Triangle read by rows: T(n,k) is the number of end rhyme patterns of a poem of an even number of lines (2n) with 1<=k<=n evenly rhymed sounds.at n=34A156289
• Exponential Riordan array [1/sqrt(1-2x), x/(1-2x)].at n=38A176230
• Coefficient array of orthogonal polynomials whose moment sequence is the double factorial numbers A001147.at n=38A176231
• Triangle read by rows, n>=0, k>=0, T(0,0) = 1, T(n,k) = Sum_{j=0..k} (C(n+k,k-j)*(-1)^(k-j)*2^(n-j)*Sum_{i=0..j} (C(n+j,i)*|S(n+j-i,j-i)|)), S = Stirling number of first kind.at n=43A201636
• Triangle read by rows in which the n-th row lists the multinomials A036038 for all partitions of 2n with only even parts in Abramowitz-Stegun ordering.at n=41A257468
• Number of (n+floor(n/2))-block bicoverings of an n-set.at n=15A275521
• a(n) = Product_{d|n, d<n} prime(A318881(d)), where A318881(d) records the prime signature of A000010(d).at n=71A319342
• Triangle, read by rows, of Lambert's denominator polynomials related to convergents of tan(x).at n=59A334823
• Table read by rows. Interpolating the swinging factorial (A056040) and the double factorial (A001147).at n=43A350464