# A012388 (b-file synthesized from sequence entry) 0 0 1 2 2 16 3 392 4 21376 5 2117792 6 333550336 7 76433892992 8 23981418704896 9 9862199971860992 10 5144452992189485056 11 3317894031273853601792 12 2591931617534673513250816 13 2411532576645611695219515392