a(n) = (1/4)*(9^n - 2*4^n + 3), n > 0; a(0) = 0.

A386359

a(n) = (1/4)*(9^n - 2*4^n + 3), n > 0; a(0) = 0.

Terms

    a(0) =0a(1) =1a(2) =13a(3) =151a(4) =1513a(5) =14251a(6) =130813a(7) =1187551a(8) =10728913a(9) =96724051a(10) =871171813a(11) =7843167751a(12) =70598995513a(13) =635432902651

External references