18943

Appears in sequences

• Sum of smallest parts of all partitions of n.at n=35A046746
• Björner-Welker sequence: 2^n*(n^2 + n + 2) - 1.at n=8A055580
• McKay-Thompson series of class 22A for Monster.at n=26A058567
• Composite numbers whose divisors (except 1) all contain the digit 9.at n=36A062680
• Centered 22-gonal numbers.at n=41A069173
• Number of partitions of n into numbers having in binary representation at most trailing zeros.at n=45A087750
• Number of singular n X n rational {0,1}-matrices with no zero rows or columns.at n=3A116507
• A sequence of asymptotic density zeta(10) - 1, where zeta is the Riemann zeta function.at n=18A143036
• Zero followed by partial sums of A008865.at n=38A145067
• a(n) = 512n - 1.at n=36A158011
• a(n) = 74*n^2 - 1.at n=15A158744
• a(n) = 37*2^(n-1)-1.at n=9A171390
• Triangle read by rows: T(n,k) is the number of 2-compositions of n having k nonzero entries in the top row. A 2-composition of n is a nonnegative matrix with two rows, such that each column has at least one nonzero entry and whose entries sum up to n.at n=57A181332
• Mirror of the triangle A193816.at n=57A193817
• Triangle of coefficients of polynomials u(n,x) jointly generated with A210198; see the Formula section.at n=44A210197
• Expansion of 1/((1-2*x)^5*(1-x)).at n=6A211386
• Expansion of -(4*x + sqrt(1-8*x) - 1)/(sqrt(1-8*x)*(4*x^2+x) + 8*x^2 - x).at n=5A240721
• Number of (n+1) X (4+1) 0..1 arrays with every 2 X 2 subblock antidiagonal maximum minus diagonal minimum nondecreasing horizontally and diagonal maximum minus antidiagonal minimum nondecreasing vertically.at n=26A253393
• Ulam numbers k such that 4*k and 16*k are also Ulam numbers.at n=27A287634
• T(n, k) = binomial(2*n - 1 - k, k - 1)*hypergeom([2, 2, 1-k], [1, 1 - 2*k + 2*n], -1), triangle read by rows, T(n, k) for n >= 1 and 1 <= k <= n.at n=53A320905