Row sums of (A008550 formatted as a triangular array).

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =11a(5) =32a(6) =114a(7) =467a(8) =2130a(9) =10642a(10) =57629a(11) =335381a(12) =2082582a(13) =13716502a(14) =95352529a(15) =696790819a(16) =5334094259a(17) =42649956716a(18) =355261078352