215424

Appears in sequences

• a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = (Lucas numbers), t = (primes).at n=29A024478
• Duplicate of A024478.at n=29A025090
• a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (Lucas numbers), t = (primes).at n=28A025098
• (Sum of digits of n)^6 - (sum of digits^6 of n).at n=26A069966
• a(n) = n! - ((n-1)!!)^2.at n=7A088979
• Triangle read by rows: k-th "a-number" of star graph K_{1,n-1}.at n=53A220901
• Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 1 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 1 3 4 6 or 7.at n=4A252237
• Number of (n+2) X (5+2) 0..3 arrays with every 3 X 3 subblock row and column sum not equal to 1 3 4 6 or 7 and every 3 X 3 diagonal and antidiagonal sum equal to 1 3 4 6 or 7.at n=1A252240
• T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 1 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 1 3 4 6 or 7.at n=16A252243
• T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 1 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 1 3 4 6 or 7.at n=19A252243
• First elements of maximal isospectral chains of length 3.at n=28A335082
• Expansion of g.f. A(x) satisfying A(x) = A( x^2*(1+x)^3 ) / (x*(1+x)^2).at n=16A369546
• Obverse convolution (n^2)**(2^n); see Comments.at n=4A374887