38285

Appears in sequences

• Expansion of g.f. -(1+x^2+x^4)/((x^3+x^2+x-1)*(x-1)^2).at n=15A104187
• Number of (n+3) X 5 0..1 matrices with each 4 X 4 subblock idempotent.at n=18A224562
• Fundamental discriminants d uniquely characterizing all complex biquadratic fields Q(sqrt(-3),sqrt(d)) which have 3-class group of type (3,3) and second 3-class group isomorphic to either SmallGroup(2187,247)-#1;5 or SmallGroup(2187,247)-#1;9.at n=11A250242
• a(n) = numerator(b(n)), where b(0) = b(1) = 1 and b(n) = n*b(n-1)/b(n-2) for n >= 1.at n=31A329654
• a(n) = denominator(b(n)), where b(0) = b(1) = 1 and b(n) = n*b(n-1)/b(n-2) for n >= 1.at n=34A329813
• a(n) = ((n + 1) - 9*(n + 1)^2 + 8*(n + 1)^3)/6.at n=30A331987