Antidiagonal sums of the array A391685.

Terms

a(0) =1a(1) =12a(2) =63a(3) =274a(4) =1125a(5) =4536a(6) =18187a(7) =72798a(8) =291249a(9) =1165060a(10) =4660311a(11) =18641322a(12) =74565373a(13) =298261584a(14) =1193046435a(15) =4772185846a(16) =19088743497a(17) =76354974108a(18) =305419896559