Triangle read by rows: T(n,k) = 4*T(n-1,k-1) + T(n,k-1) with T(2*m,0) = 0 and T(2*m+1,0) = 5^m.

Terms

a(0) =0a(1) =1a(2) =1a(3) =0a(4) =4a(5) =8a(6) =5a(7) =5a(8) =21a(9) =53a(10) =0a(11) =20a(12) =40a(13) =124a(14) =336a(15) =25a(16) =25a(17) =105a(18) =265a(19) =761a(20) =2105a(21) =0a(22) =100a(23) =200a(24) =620a(25) =1680a(26) =4724a(27) =13144a(28) =125a(29) =125