# A075114 (b-file synthesized from sequence entry) 1 4 2 121 3 144 4 4900 5 166464 6 5654884 7 192099600 8 6525731524 9 221682772224 10 7530688524100 11 255821727047184 12 8690408031080164 13 295218051329678400 14 10028723337177985444 15 340681375412721826704