Triangular number pertaining to A081974. a(n) = A081974(n)*A081974(n+1).

Terms

a(0) =3a(1) =6a(2) =10a(3) =45a(4) =36a(5) =28a(6) =91a(7) =78a(8) =66a(9) =231a(10) =210a(11) =120a(12) =276a(13) =1035a(14) =630a(15) =378a(16) =1431a(17) =1378a(18) =780a(19) =990a(20) =528a(21) =496a(22) =465a(23) =300a(24) =820a(25) =3321a(26) =3240a(27) =2080a(28) =5356a(29) =5253