a(n) = ((1 - sqrt(3))^n + (1 + sqrt(3))^n)/2^floor((n - 1)/2); n-th row common denominator of A321118.

A321119

a(n) = ((1 - sqrt(3))^n + (1 + sqrt(3))^n)/2^floor((n - 1)/2); n-th row common denominator of A321118.

Terms

    a(0) =4a(1) =2a(2) =8a(3) =10a(4) =28a(5) =38a(6) =104a(7) =142a(8) =388a(9) =530a(10) =1448a(11) =1978a(12) =5404a(13) =7382a(14) =20168a(15) =27550a(16) =75268a(17) =102818a(18) =280904a(19) =383722a(20) =1048348a(21) =1432070a(22) =3912488a(23) =5344558a(24) =14601604a(25) =19946162a(26) =54493928a(27) =74440090a(28) =203374108a(29) =277814198

External references