28884

Appears in sequences

• a(n) = Sum_{i=1..floor((n+1)/4)} a(2*i-1) * a(n-2*i+1), with a(1)=a(2)=1 and a(3)=4.at n=16A024727
• McKay-Thompson series of class 35A for Monster.at n=47A058640
• a(n) = s(2*n) where s(0) = 0, s(1) = s(2) = 1, s(n) = abs(Sum_{k=2..n-1} (-1)^k * s(n-k) * s(k)).at n=46A072851
• Sum of the first k-1 numbers in the k-th column of the natural number array A000027, by antidiagonals.at n=29A185788
• Square array A(n,k), n>=1, k>=1, read by antidiagonals: A(n,k) is the number of n-colorings of the complete bipartite graph K_(k,k).at n=39A212085
• Principal diagonal of the convolution array A213838.at n=17A213839
• Molien series for invariants of finite Coxeter group D_10 (bisected).at n=41A266773
• Number of cyclic change-ringing sequences of length n for 9 bells.at n=3A324952
• G.f.: Sum_{k>=1} (k^3 * x^(k^2) / Product_{j=1..k} (1 - x^j)).at n=41A333151
• E.g.f. A(x) satisfies A'(x) = exp( A(x)*A'(x)^2 ).at n=5A392206