a(1) = 0, then smallest triangular number such that a(n+1)- a(n) is a palindrome.

Terms

a(0) =0a(1) =1a(2) =3a(3) =6a(4) =10a(5) =15a(6) =21a(7) =28a(8) =36a(9) =45a(10) =78a(11) =300a(12) =946a(13) =990a(14) =1596a(15) =2080a(16) =2211a(17) =3160a(18) =3321a(19) =3916a(20) =13695a(21) =14028a(22) =17020a(23) =34191a(24) =34453a(25) =38226a(26) =38781a(27) =82215a(28) =83436a(29) =87990