A366724 - OEIS

%I #6 Oct 18 2023 10:05:45

%S 1,3,8,18,37,70,123,203,318,477,690,968,1323,1768,2317,2985,3788,4743,

%T 5868,7182,8705,10458,12463,14743,17322,20225,23478,27108,31143,35612,

%U 40545,45973,51928,58443,65552,73290,81693,90798,100643,111267,122710,135013,148218,162368,177507,193680

%N First index k where A366574(k) = n.

%C See A366574 for further details.

%F Conjectured: for n > 1, a(n) = (n-1)*(n^3 + 3*n^2 - 10*n + 72)/24 .

%Y Cf. A366574.

%K nonn

%O 1,2

%A _Scott R. Shannon_, Oct 17 2023