18865

Appears in sequences

• Numbers whose base-7 representation contains exactly four 0's.at n=29A043396
• a(n) = Sum_{i=0..n} T(i,n-i), array T as in A048149.at n=32A049712
• McKay-Thompson series of class 35B for Monster.at n=44A058641
• Numbers n such that 4*10^n + 3*R_n + 4 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=27A102989
• Triangle read by rows: T(n, m) = number of forests with n nodes and m labeled trees. Also number of forests with exactly n - m edges on n labeled nodes.at n=31A105599
• a(0)=1, a(1)=1, a(n)=7*a(n/2) for n=2,4,6,..., a(n)=6*a((n-1)/2)+a((n+1)/2) for n=3,5,7,....at n=40A116522
• (1/8)*number of lattice points with odd indices in a cubic lattice inside a sphere around the origin with radius 2*n.at n=32A120884
• Number of Garden of Eden partitions of n in Bulgarian Solitaire.at n=40A123975
• Matrix cube of triangle U = A136228, read by rows.at n=24A136236
• Triangle read by rows: T(n, k) is the number of forests on n labeled nodes with k edges. T(n, k) for n >= 1 and 0 <= k <= n-1.at n=32A138464
• Totally multiplicative sequence with a(p) = a(p-1) + 6 for prime p.at n=39A166703
• Number of compositions of n such that the smallest part is divisible by the number of parts.at n=47A171628
• a(n) = n*(n+1)*(7*n^2 - n - 4)/4.at n=10A172077
• Number of nondecreasing arrangements of n+3 numbers in 0..5 with each number being the sum mod 6 of three others.at n=12A183900
• Number of n X 3 0..2 arrays with every row and column nondecreasing rightwards and downwards, and the number of instances of each value within one of each other.at n=39A201272
• McKay-Thompson series of class 35B for the Monster group with a(0) = 1.at n=44A212253
• Number of partitions of n such that m(1) > m(2), where m = multiplicity.at n=39A240056
• Number of forests with n labeled nodes and 4 trees.at n=4A240681
• Prime factorization representation of Stern polynomials: a(0) = 1, a(1) = 2, a(2n) = A003961(a(n)), a(2n+1) = a(n)*a(n+1).at n=44A260443
• Even bisection of A260443 (the odd terms): a(n) = A260443(2*n).at n=22A277323