Fourth row of Pascal-(1,3,1) array A081578.

Terms

a(0) =1a(1) =13a(2) =73a(3) =245a(4) =593a(5) =1181a(6) =2073a(7) =3333a(8) =5025a(9) =7213a(10) =9961a(11) =13333a(12) =17393a(13) =22205a(14) =27833a(15) =34341a(16) =41793a(17) =50253a(18) =59785a(19) =70453a(20) =82321a(21) =95453a(22) =109913a(23) =125765a(24) =143073a(25) =161901a(26) =182313a(27) =204373a(28) =228145a(29) =253693