42577920

Appears in sequences

• a(n) = 2^(n-1) * n! * Catalan(n-1) for n > 0 with a(0) = 0.at n=7A052714
• Group even numbers into (2,4), (6,8,10,12), (14,16,18,20,22,24), ...; a(n) = product of n-th group.at n=2A062030
• Product of n-th group of terms in A074147.at n=5A082735
• Expansion of (1+2*x-4*x^2)/((2*x+1)*(2*x-1)*(4*x^2+4*x-1)).at n=11A110047
• Terms in A005179 where prime signature differs from that of corresponding term in A038547.at n=27A122813
• Partial products of successive terms of A017113; a(0)=1.at n=6A144828
• Number of n-length words w over a 7-ary alphabet {a1,a2,...,a7} such that #(w,a1) >= #(w,a2) >= ... >= #(w,a7) >= 1, where #(w,x) counts the letters x in word w.at n=5A226886
• Square array A(n,k), n>=0, k>=0, read by antidiagonals, where column k is the expansion of e.g.f. 1/sqrt(1 - 2*k*x).at n=61A292783