24144

Appears in sequences

• a(n) is the concatenation of n and 6n.at n=23A009440
• McKay-Thompson series of class 16C for Monster.at n=19A058516
• Multiples of 3018.at n=7A086746
• a(n) = Sum_{k=0..floor(n/3)} C(n-k,2*k) * 2^k * 4^(n-3*k).at n=7A099782
• Number of bipartite connected outerplanar graphs on n unlabeled nodes.at n=12A111758
• McKay-Thompson series of class 16C for the Monster group with a(0) = 2.at n=19A176143
• Triangle of coefficients of polynomials v(n,x) jointly generated with A208759; see the Formula section.at n=53A208760
• Triangle of coefficients of polynomials v(n,x) jointly generated with A208761; see the Formula section.at n=51A208762
• McKay-Thompson series of class 16C for the Monster group with a(0) = 4.at n=19A214035
• Number of compositions of n with exactly 2 transitions between different parts.at n=38A244714
• Number of 3-Motzkin paths of length n with no level steps at even level.at n=10A257290
• Expansion of 1/(1 - x*Product_{k>=1} (1 - x^k)).at n=32A299105
• Number of subsets of {1..n} containing the sum of every subset whose sum is <= n.at n=23A326080
• Number of free polyominoids with n cells, allowing flat corner-connections and any edge-connections.at n=5A365997
• Expansion of 1/sqrt(1 - 4*x - 8*x^3 + 4*x^4).at n=8A375276