a(n) is the smallest positive integer which can be represented as the sum of n distinct nonzero tetrahedral numbers in exactly n ways, or -1 if no such integer exists.

A360217

a(n) is the smallest positive integer which can be represented as the sum of n distinct nonzero tetrahedral numbers in exactly n ways, or -1 if no such integer exists.

Terms

    a(0) =1a(1) =140a(2) =305a(3) =315a(4) =435a(5) =644a(6) =830a(7) =1141a(8) =1425a(9) =1925a(10) =2380a(11) =3010a(12) =3805a(13) =4720a(14) =5806a(15) =7095a(16) =8510a(17) =10200a(18) =12020a(19) =14115a(20) =16460a(21) =19131a(22) =21990a(23) =25425a(24) =29275a(25) =33495a(26) =37425a(27) =42680a(28) =48300a(29) =54545

External references