两道数列题1)1,2,3,4,5,12,7,48,(),()2)
1)1,2,3,4,5,12,7,48,( ),( ) 2)3,4,7,9,15,16,31,25,( ),( )
1) (9),(240) 奇数项为1,3,5,7,9 偶数项为2*1!=2,2*2!=4,2*3!=12,2*4!=48,2*5!=240 2)(63),(36) 奇数项为2^2-1=3,2^3-1=7,2^4-1=15,2^5-1=31,2^6-1=63 偶数项为2^2=4,3^2=9,4^2=16,5^2=25,6^2=36