Index of first occurrence of n in A122921.

Terms

a(0) =0a(1) =1a(2) =5a(3) =11a(4) =24a(5) =39a(6) =53a(7) =83a(8) =96a(9) =155a(10) =176a(11) =257a(12) =224a(13) =335a(14) =376a(15) =499a(16) =384a(17) =687a(18) =701a(19) =899a(20) =704a(21) =1043a(22) =1104a(23) =1379a(24) =896a(25) =1559a(26) =1584a(27) =1883a(28) =1504a(29) =2239