A339576 Row sums of triangle A236104.

1, 4, 10, 17, 29, 41, 59, 74, 101, 121, 151, 179, 215, 245, 295, 326, 374, 423, 477, 519, 591, 641, 707, 767, 844, 904, 1000, 1056, 1140, 1234, 1324, 1387, 1507, 1587, 1701, 1794, 1902, 1992, 2136, 2226, 2346, 2476, 2602, 2692, 2874, 2984, 3122, 3246, 3397

Offset

1,2

Comments

In other words, a(n) is the sum of squares of terms in row n of A235791.

Links

Table of n, a(n) for n=1..49.

Maple

a:= n-> add(ceil((n+1)/k-(k+1)/2)^2, k=1..floor((sqrt(8*n+1)-1)/2)):
seq(a(n), n=1..60);  # Alois P. Heinz, Dec 18 2020

Prog

(PARI) a(n) = sum(k=1, floor((sqrt(8*n+1)-1)/2), ceil((n+1)/k-(k+1)/2)^2) \\ Felix Fröhlich, Dec 19 2020; adapted from Maple code

Crossrefs

Cf. A024916, A060831, A235791, A236104, A237593, A240542.

Sequence in context: A301195 A008022 A213497 * A047699 A167209 A096077

Adjacent sequences: A339573 A339574 A339575 * A339577 A339578 A339579

Keyword

nonn

Author

N. J. A. Sloane, Dec 18 2020

Status

approved