Row sums of triangle A105542, which equals the matrix square of triangle A105540.

Terms

a(0) =1a(1) =3a(2) =9a(3) =21a(4) =50a(5) =132a(6) =293a(7) =660a(8) =1506a(9) =3245a(10) =7076a(11) =16106a(12) =34583a(13) =71142a(14) =152060a(15) =324278a(16) =675302a(17) =1376229a(18) =2802336a(19) =5785296a(20) =11845829a(21) =23776227a(22) =46881076a(23) =93000635a(24) =184777349a(25) =365374417a(26) =715280116a(27) =1384696572a(28) =2662428956a(29) =5123722227