1291401630

Appears in sequences

• a(n) = 10*3^n.at n=17A005052
• Let S(t) = 1 + s_1*t + s_2*t^2 + ... satisfy S' = -S/(2 + S); sequence gives denominators of s_n.at n=9A058956
• a(n) = n^n * (n^2 - 1)/24.at n=6A060348
• Diagonal of table A062104.at n=20A062107