A366724 First index k where A366574(k) = n.

1, 3, 8, 18, 37, 70, 123, 203, 318, 477, 690, 968, 1323, 1768, 2317, 2985, 3788, 4743, 5868, 7182, 8705, 10458, 12463, 14743, 17322, 20225, 23478, 27108, 31143, 35612, 40545, 45973, 51928, 58443, 65552, 73290, 81693, 90798, 100643, 111267, 122710, 135013, 148218, 162368, 177507, 193680

Offset: 1

Author

Scott R. Shannon, Oct 17 2023

Keywords

• nonn

Comments

See A366574 for further details.

Crossrefs

Cf. A366574.

Formula

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