A281970 Number of sets of exactly n positive integers <= n+7 having a square element sum.

1, 2, 6, 15, 34, 71, 134, 238, 405, 660, 1030, 1559, 2310, 3336, 4691, 6500, 8886, 11899, 15709, 20584, 26624, 33926, 42974, 54080, 67172, 82800, 101787, 124031, 149660, 180251, 216171, 256730, 303737, 359036, 421356, 491196, 572792, 665539, 767239, 883380

Offset

0,2

Links

Alois P. Heinz, Table of n, a(n) for n = 0..1000

Formula

a(n) = A281871(n+7,n).

Example

a(3) = 15: {1,2,6}, {1,3,5}, {1,5,10}, {1,6,9}, {1,7,8}, {2,3,4}, {2,4,10}, {2,5,9}, {2,6,8}, {3,4,9}, {3,5,8}, {3,6,7}, {4,5,7}, {6,9,10}, {7,8,10}.

Crossrefs

A diagonal of A281871.

Sequence in context: A246320 A101352 A192980 * A221719 A095380 A287012

Adjacent sequences: A281967 A281968 A281969 * A281971 A281972 A281973

Keyword

nonn

Author

Alois P. Heinz, Feb 03 2017

Status

approved