# A075398 (b-file synthesized from sequence entry) 1 4 2 8 3 32 4 128 5 8192 6 131072 7 524288 8 2147483648 9 2305843009213693952 10 618970019642690137449562112 11 162259276829213363391578010288128 12 170141183460469231731687303715884105728