a(n) is the sum of the terms of the symmetric square array defined by M(i,j) = prime(i)+i-j for i >= j and M(i,j) = M(j,i) if i < j.

A308731

a(n) is the sum of the terms of the symmetric square array defined by M(i,j) = prime(i)+i-j for i >= j and M(i,j) = M(j,i) if i < j.

Terms

    a(0) =2a(1) =13a(2) =44a(3) =105a(4) =224a(5) =397a(6) =660a(7) =1001a(8) =1464a(9) =2105a(10) =2866a(11) =3849a(12) =5030a(13) =6373a(14) =7946a(15) =9829a(16) =12048a(17) =14489a(18) =17310a(19) =20459a(20) =23872a(21) =27731a(22) =31972a(23) =36707a(24) =42060a(25) =47861a(26) =54022a(27) =60663a(28) =67688a(29) =75225

External references