660480

Appears in sequences

• sech(sinh(x)*arcsin(x))=1-12/4!*x^4-240/6!*x^6+1680/8!*x^8...at n=5A012544
• Number of strongly triple-free subsets of {1, 2, ..., n}.at n=25A050295
• The number of bijections f:{1,...,n}->Z/nZ such that f(ab)=f(a)+f(b) whenever all three function values are defined.at n=39A179989
• Number of (n+2)X(1+2) 0..1 arrays with every 3X3 subblock diagonal maximum plus antidiagonal minimum nondecreasing horizontally and vertically.at n=4A253856
• Number of (n+2)X(5+2) 0..1 arrays with every 3X3 subblock diagonal maximum plus antidiagonal minimum nondecreasing horizontally and vertically.at n=0A253860
• T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with every 3X3 subblock diagonal maximum plus antidiagonal minimum nondecreasing horizontally and vertically.at n=10A253863
• T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with every 3X3 subblock diagonal maximum plus antidiagonal minimum nondecreasing horizontally and vertically.at n=14A253863
• Number of (n+2)X(5+2) 0..1 arrays with every 3X3 subblock diagonal maximum plus antidiagonal minimum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=0A254488
• T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with every 3X3 subblock diagonal maximum plus antidiagonal minimum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=10A254491
• T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with every 3X3 subblock diagonal maximum plus antidiagonal minimum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=14A254491
• Number of (5+2)X(n+2) 0..1 arrays with every 3X3 subblock diagonal maximum plus antidiagonal minimum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=0A254495
• Coefficients in expansion of E_4^(1/4) in powers of q.at n=3A289307