Binomial transform of tribonacci sequence A000073.

Terms

a(0) =0a(1) =0a(2) =1a(3) =4a(4) =12a(5) =34a(6) =96a(7) =272a(8) =772a(9) =2192a(10) =6224a(11) =17672a(12) =50176a(13) =142464a(14) =404496a(15) =1148480a(16) =3260864a(17) =9258528a(18) =26287616a(19) =74638080a(20) =211918912a(21) =601698560a(22) =1708394752a(23) =4850622592a(24) =13772308480a(25) =39103533056a(26) =111026143488a(27) =315235058688a(28) =895042726912