Row sums of triangle A171843.

Terms

a(0) =1a(1) =4a(2) =12a(3) =31a(4) =77a(5) =188a(6) =462a(7) =1148a(8) =2887a(9) =7335a(10) =18789a(11) =48419a(12) =125321a(13) =325381a(14) =846713a(15) =2206891a(16) =5758797a(17) =15040102a(18) =39304237a(19) =102760572a(20) =268757551a(21) =703079117a(22) =1839625401a(23) =4814107671a(24) =12599351527a(25) =32977310272a(26) =86319400527a(27) =225954695164a(28) =591492569038