# A005948 (b-file synthesized from sequence entry) 0 0 1 6 2 52 3 411 4 3392 5 30070 6 287802 7 2969267 8 32902560 9 389989449 10 4924511300 11 65995764461 12 935412316380 13 13978234748257 14 219593721606826 15 3617245945896600 16 62330776215811680 17 1121143456571006754 18 21008889235589947362