109216785

Appears in sequences

• Number of independent vertex sets in the n-prism graph Y_n = K_2 X C_n (n > 2).at n=21A051927
• Main diagonal of triangle A100226.at n=21A100227
• Continued fraction expansion for exp( Sum_{n>=1} 1/(n*A002203(n)) ), where A002203(n) = (1+sqrt(2))^n + (1-sqrt(2))^n.at n=31A174504
• Number of odd chordless cycles of length >4 in the (2n+1)-flower snark.at n=10A362545