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COMMENTS
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a(9) >= 1491840 (K_1,1,7).
Table of graphs achieving these maxima:
1: K_1
2: K_2 = P_2
3: K_3 = C_3 = K_1,1,1
4: K_4
5: K_1,1,3
6: K_1,1,4
7: K_1,1,5
8: K_1,1,6
a(4) fails to correspond to the diamond graph K_1,1,2 since K_4 has 48 graceful labelings, while K_1,1,2 has only 32.
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