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A268413 as a simple table

na(n)
01
1-13
2183
3-2561
435855
5-501969
67027567
7-98385937
81377403119
9-19283643665
10269971011311
11-3779594158353
1252914318216943
13-740800455037201
1410371206370520815
15-145196889187291409
162032756448622079727
17-28458590280709116177
18398420263929927626479

[1,-13,183,-2561,35855,-501969,7027567,-98385937,
 1377403119,-19283643665,269971011311,
 -3779594158353,52914318216943,-740800455037201,
 10371206370520815,-145196889187291409,
 2032756448622079727,-28458590280709116177,
 398420263929927626479]