Numbers simultaneously triangular and centered triangular.

A128862

Numbers simultaneously triangular and centered triangular.

Terms

    a(0) =1a(1) =10a(2) =136a(3) =1891a(4) =26335a(5) =366796a(6) =5108806a(7) =71156485a(8) =991081981a(9) =13803991246a(10) =192264795460

External references