-4418

Appears in sequences

• Triangle of coefficients of powers of e^2 in numerators of Sum_{k>=1} {1 / (1 + k^2*Pi^2)^n}.at n=15A085470
• a(n) = a(n-1) - 4*a(n-2), a(0)=1, a(1)=2.at n=12A133631
• a(n) = (-n^3 + 9n^2 - 5n + 3)/3.at n=27A161702
• A377091(k) for k in A379802.at n=42A379803