Natural numbers repeated 3 times are taken in parts of successive lengths 1,2,3,..., and a(n) is the sum of the numbers in the part with length n.

A370880

Natural numbers repeated 3 times are taken in parts of successive lengths 1,2,3,..., and a(n) is the sum of the numbers in the part with length n.

Terms

    a(0) =1a(1) =2a(2) =6a(3) =13a(4) =23a(5) =39a(6) =61a(7) =89a(8) =126a(9) =172a(10) =227a(11) =294a(12) =373a(13) =464a(14) =570a(15) =691a(16) =827a(17) =981a(18) =1153a(19) =1343a(20) =1554a(21) =1786a(22) =2039a(23) =2316a(24) =2617a(25) =2942a(26) =3294a(27) =3673a(28) =4079a(29) =4515

External references