305892

Appears in sequences

• Define C(n) by the recursion C(0) = 6*i where i^2 = -1, C(n+1) = 1/(1 + C(n)), then a(n) = 6*(-1)^n/Im(C(n)) where Im(z) denotes the imaginary part of z.at n=11A069963
• Triangle read by rows: T(n,k) is the number of crystallized linear chord diagrams on n chords with k short chords.at n=38A375504