Sum of numbers in the n-th antidiagonal of the reciprocity array of 2.

Terms

a(0) =2a(1) =5a(2) =8a(3) =17a(4) =30a(5) =50a(6) =78a(7) =116a(8) =162a(9) =227a(10) =300a(11) =389a(12) =498a(13) =628a(14) =766a(15) =940a(16) =1128a(17) =1347a(18) =1584a(19) =1855a(20) =2146a(21) =2486a(22) =2838a(23) =3236a(24) =3660a(25) =4135a(26) =4626a(27) =5177a(28) =5754a(29) =6392