Table of n, a(n) for n=2..7.
Ed Pegg, Jr., Triangles
Z. Skupien, A. Zak, Pair-sums packing and rainbow cliques, in Topics In Graph Theory, A tribute to A. A. and T. E. Zykovs on the occasion of A. A. Zykov's 90th birthday, ed. R. Tyshkevich, Univ. Illinois, 2013, pages 131-144, (in English and Russian).
Miroslav Vicher, Triangle Partitions
Eric Weisstein's World of Mathematics, Triangle Dissection